diff --git a/base/sync_socket.h b/base/sync_socket.h
deleted file mode 100644
index 9d582da..0000000
--- a/base/sync_socket.h
+++ /dev/null
@@ -1,161 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef BASE_SYNC_SOCKET_H_
-#define BASE_SYNC_SOCKET_H_
-
-// A socket abstraction used for sending and receiving plain
-// data.  Because the receiving is blocking, they can be used to perform
-// rudimentary cross-process synchronization with low latency.
-
-#include <stddef.h>
-
-#include "base/base_export.h"
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "base/process/process_handle.h"
-#include "base/synchronization/waitable_event.h"
-#include "base/time/time.h"
-#include "build_config.h"
-
-#if defined(OS_WIN)
-#include <windows.h>
-#endif
-#include <sys/types.h>
-
-#if defined(OS_POSIX) || defined(OS_FUCHSIA)
-#include "base/file_descriptor_posix.h"
-#endif
-
-namespace base {
-
-class BASE_EXPORT SyncSocket {
- public:
-#if defined(OS_WIN)
-  typedef HANDLE Handle;
-  typedef Handle TransitDescriptor;
-#elif defined(OS_POSIX) || defined(OS_FUCHSIA)
-  typedef int Handle;
-  typedef FileDescriptor TransitDescriptor;
-#endif
-  static const Handle kInvalidHandle;
-
-  SyncSocket();
-
-  // Creates a SyncSocket from a Handle.  Used in transport.
-  explicit SyncSocket(Handle handle) : handle_(handle)  {}
-  virtual ~SyncSocket();
-
-  // Initializes and connects a pair of sockets.
-  // |socket_a| and |socket_b| must not hold a valid handle.  Upon successful
-  // return, the sockets will both be valid and connected.
-  static bool CreatePair(SyncSocket* socket_a, SyncSocket* socket_b);
-
-  // Returns |Handle| wrapped in a |TransitDescriptor|.
-  static Handle UnwrapHandle(const TransitDescriptor& descriptor);
-
-  // Prepares a |TransitDescriptor| which wraps |Handle| used for transit.
-  // This is used to prepare the underlying shared resource before passing back
-  // the handle to be used by the peer process.
-  bool PrepareTransitDescriptor(ProcessHandle peer_process_handle,
-                                TransitDescriptor* descriptor);
-
-  // Closes the SyncSocket.  Returns true on success, false on failure.
-  virtual bool Close();
-
-  // Sends the message to the remote peer of the SyncSocket.
-  // Note it is not safe to send messages from the same socket handle by
-  // multiple threads simultaneously.
-  // buffer is a pointer to the data to send.
-  // length is the length of the data to send (must be non-zero).
-  // Returns the number of bytes sent, or 0 upon failure.
-  virtual size_t Send(const void* buffer, size_t length);
-
-  // Receives a message from an SyncSocket.
-  // buffer is a pointer to the buffer to receive data.
-  // length is the number of bytes of data to receive (must be non-zero).
-  // Returns the number of bytes received, or 0 upon failure.
-  virtual size_t Receive(void* buffer, size_t length);
-
-  // Same as Receive() but only blocks for data until |timeout| has elapsed or
-  // |buffer| |length| is exhausted.  Currently only timeouts less than one
-  // second are allowed.  Return the amount of data read.
-  virtual size_t ReceiveWithTimeout(void* buffer,
-                                    size_t length,
-                                    TimeDelta timeout);
-
-  // Returns the number of bytes available. If non-zero, Receive() will not
-  // not block when called.
-  virtual size_t Peek();
-
-  // Extracts the contained handle.  Used for transferring between
-  // processes.
-  Handle handle() const { return handle_; }
-
-  // Extracts and takes ownership of the contained handle.
-  Handle Release();
-
- protected:
-  Handle handle_;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(SyncSocket);
-};
-
-// Derives from SyncSocket and adds support for shutting down the socket from
-// another thread while a blocking Receive or Send is being done from the
-// thread that owns the socket.
-class BASE_EXPORT CancelableSyncSocket : public SyncSocket {
- public:
-  CancelableSyncSocket();
-  explicit CancelableSyncSocket(Handle handle);
-  ~CancelableSyncSocket() override = default;
-
-  // Initializes a pair of cancelable sockets.  See documentation for
-  // SyncSocket::CreatePair for more details.
-  static bool CreatePair(CancelableSyncSocket* socket_a,
-                         CancelableSyncSocket* socket_b);
-
-  // A way to shut down a socket even if another thread is currently performing
-  // a blocking Receive or Send.
-  bool Shutdown();
-
-#if defined(OS_WIN)
-  // Since the Linux and Mac implementations actually use a socket, shutting
-  // them down from another thread is pretty simple - we can just call
-  // shutdown().  However, the Windows implementation relies on named pipes
-  // and there isn't a way to cancel a blocking synchronous Read that is
-  // supported on <Vista. So, for Windows only, we override these
-  // SyncSocket methods in order to support shutting down the 'socket'.
-  bool Close() override;
-  size_t Receive(void* buffer, size_t length) override;
-  size_t ReceiveWithTimeout(void* buffer,
-                            size_t length,
-                            TimeDelta timeout) override;
-#endif
-
-  // Send() is overridden to catch cases where the remote end is not responding
-  // and we fill the local socket buffer. When the buffer is full, this
-  // implementation of Send() will not block indefinitely as
-  // SyncSocket::Send will, but instead return 0, as no bytes could be sent.
-  // Note that the socket will not be closed in this case.
-  size_t Send(const void* buffer, size_t length) override;
-
- private:
-#if defined(OS_WIN)
-  WaitableEvent shutdown_event_;
-  WaitableEvent file_operation_;
-#endif
-  DISALLOW_COPY_AND_ASSIGN(CancelableSyncSocket);
-};
-
-#if defined(OS_WIN) && !defined(COMPONENT_BUILD)
-// TODO(cpu): remove this once chrome is split in two dlls.
-__declspec(selectany)
-    const SyncSocket::Handle SyncSocket::kInvalidHandle = INVALID_HANDLE_VALUE;
-#endif
-
-}  // namespace base
-
-#endif  // BASE_SYNC_SOCKET_H_
diff --git a/base/sync_socket_nacl.cc b/base/sync_socket_nacl.cc
deleted file mode 100644
index 19a20be..0000000
--- a/base/sync_socket_nacl.cc
+++ /dev/null
@@ -1,105 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/sync_socket.h"
-
-#include <errno.h>
-#include <limits.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <sys/types.h>
-
-#include "base/logging.h"
-
-namespace base {
-
-const SyncSocket::Handle SyncSocket::kInvalidHandle = -1;
-
-SyncSocket::SyncSocket() : handle_(kInvalidHandle) {
-}
-
-SyncSocket::~SyncSocket() {
-  Close();
-}
-
-// static
-bool SyncSocket::CreatePair(SyncSocket* socket_a, SyncSocket* socket_b) {
-  return false;
-}
-
-// static
-SyncSocket::Handle SyncSocket::UnwrapHandle(
-    const SyncSocket::TransitDescriptor& descriptor) {
-  // TODO(xians): Still unclear how NaCl uses SyncSocket.
-  // See http://crbug.com/409656
-  NOTIMPLEMENTED();
-  return SyncSocket::kInvalidHandle;
-}
-
-bool SyncSocket::PrepareTransitDescriptor(
-    ProcessHandle peer_process_handle,
-    SyncSocket::TransitDescriptor* descriptor) {
-  // TODO(xians): Still unclear how NaCl uses SyncSocket.
-  // See http://crbug.com/409656
-  NOTIMPLEMENTED();
-  return false;
-}
-
-bool SyncSocket::Close() {
-  if (handle_ != kInvalidHandle) {
-    if (close(handle_) < 0)
-      DPLOG(ERROR) << "close";
-    handle_ = kInvalidHandle;
-  }
-  return true;
-}
-
-size_t SyncSocket::Send(const void* buffer, size_t length) {
-  const ssize_t bytes_written = write(handle_, buffer, length);
-  return bytes_written > 0 ? bytes_written : 0;
-}
-
-size_t SyncSocket::Receive(void* buffer, size_t length) {
-  const ssize_t bytes_read = read(handle_, buffer, length);
-  return bytes_read > 0 ? bytes_read : 0;
-}
-
-size_t SyncSocket::ReceiveWithTimeout(void* buffer, size_t length, TimeDelta) {
-  NOTIMPLEMENTED();
-  return 0;
-}
-
-size_t SyncSocket::Peek() {
-  NOTIMPLEMENTED();
-  return 0;
-}
-
-SyncSocket::Handle SyncSocket::Release() {
-  Handle r = handle_;
-  handle_ = kInvalidHandle;
-  return r;
-}
-
-CancelableSyncSocket::CancelableSyncSocket() {
-}
-
-CancelableSyncSocket::CancelableSyncSocket(Handle handle)
-    : SyncSocket(handle) {
-}
-
-size_t CancelableSyncSocket::Send(const void* buffer, size_t length) {
-  return SyncSocket::Send(buffer, length);
-}
-
-bool CancelableSyncSocket::Shutdown() {
-  return SyncSocket::Close();
-}
-
-// static
-bool CancelableSyncSocket::CreatePair(CancelableSyncSocket* socket_a,
-                                      CancelableSyncSocket* socket_b) {
-  return SyncSocket::CreatePair(socket_a, socket_b);
-}
-
-}  // namespace base
diff --git a/base/sync_socket_posix.cc b/base/sync_socket_posix.cc
deleted file mode 100644
index 816bb73..0000000
--- a/base/sync_socket_posix.cc
+++ /dev/null
@@ -1,253 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/sync_socket.h"
-
-#include <errno.h>
-#include <fcntl.h>
-#include <limits.h>
-#include <poll.h>
-#include <stddef.h>
-#include <stdio.h>
-#include <sys/ioctl.h>
-#include <sys/socket.h>
-#include <sys/types.h>
-
-#if defined(OS_SOLARIS)
-#include <sys/filio.h>
-#endif
-
-#include "base/files/file_util.h"
-#include "base/logging.h"
-#include "base/threading/thread_restrictions.h"
-#include "build_config.h"
-
-namespace base {
-
-namespace {
-// To avoid users sending negative message lengths to Send/Receive
-// we clamp message lengths, which are size_t, to no more than INT_MAX.
-const size_t kMaxMessageLength = static_cast<size_t>(INT_MAX);
-
-// Writes |length| of |buffer| into |handle|.  Returns the number of bytes
-// written or zero on error.  |length| must be greater than 0.
-size_t SendHelper(SyncSocket::Handle handle,
-                  const void* buffer,
-                  size_t length) {
-  DCHECK_GT(length, 0u);
-  DCHECK_LE(length, kMaxMessageLength);
-  DCHECK_NE(handle, SyncSocket::kInvalidHandle);
-  const char* charbuffer = static_cast<const char*>(buffer);
-  return WriteFileDescriptor(handle, charbuffer, length)
-             ? static_cast<size_t>(length)
-             : 0;
-}
-
-bool CloseHandle(SyncSocket::Handle handle) {
-  if (handle != SyncSocket::kInvalidHandle && close(handle) < 0) {
-    DPLOG(ERROR) << "close";
-    return false;
-  }
-
-  return true;
-}
-
-}  // namespace
-
-const SyncSocket::Handle SyncSocket::kInvalidHandle = -1;
-
-SyncSocket::SyncSocket() : handle_(kInvalidHandle) {}
-
-SyncSocket::~SyncSocket() {
-  Close();
-}
-
-// static
-bool SyncSocket::CreatePair(SyncSocket* socket_a, SyncSocket* socket_b) {
-  DCHECK_NE(socket_a, socket_b);
-  DCHECK_EQ(socket_a->handle_, kInvalidHandle);
-  DCHECK_EQ(socket_b->handle_, kInvalidHandle);
-
-#if defined(OS_MACOSX)
-  int nosigpipe = 1;
-#endif  // defined(OS_MACOSX)
-
-  Handle handles[2] = { kInvalidHandle, kInvalidHandle };
-  if (socketpair(AF_UNIX, SOCK_STREAM, 0, handles) != 0) {
-    CloseHandle(handles[0]);
-    CloseHandle(handles[1]);
-    return false;
-  }
-
-#if defined(OS_MACOSX)
-  // On OSX an attempt to read or write to a closed socket may generate a
-  // SIGPIPE rather than returning -1.  setsockopt will shut this off.
-  if (0 != setsockopt(handles[0], SOL_SOCKET, SO_NOSIGPIPE,
-                      &nosigpipe, sizeof nosigpipe) ||
-      0 != setsockopt(handles[1], SOL_SOCKET, SO_NOSIGPIPE,
-                      &nosigpipe, sizeof nosigpipe)) {
-    CloseHandle(handles[0]);
-    CloseHandle(handles[1]);
-    return false;
-  }
-#endif
-
-  // Copy the handles out for successful return.
-  socket_a->handle_ = handles[0];
-  socket_b->handle_ = handles[1];
-
-  return true;
-}
-
-// static
-SyncSocket::Handle SyncSocket::UnwrapHandle(
-    const TransitDescriptor& descriptor) {
-  return descriptor.fd;
-}
-
-bool SyncSocket::PrepareTransitDescriptor(ProcessHandle peer_process_handle,
-                                          TransitDescriptor* descriptor) {
-  descriptor->fd = handle();
-  descriptor->auto_close = false;
-  return descriptor->fd != kInvalidHandle;
-}
-
-bool SyncSocket::Close() {
-  const bool retval = CloseHandle(handle_);
-  handle_ = kInvalidHandle;
-  return retval;
-}
-
-size_t SyncSocket::Send(const void* buffer, size_t length) {
-  AssertBlockingAllowed();
-  return SendHelper(handle_, buffer, length);
-}
-
-size_t SyncSocket::Receive(void* buffer, size_t length) {
-  AssertBlockingAllowed();
-  DCHECK_GT(length, 0u);
-  DCHECK_LE(length, kMaxMessageLength);
-  DCHECK_NE(handle_, kInvalidHandle);
-  char* charbuffer = static_cast<char*>(buffer);
-  if (ReadFromFD(handle_, charbuffer, length))
-    return length;
-  return 0;
-}
-
-size_t SyncSocket::ReceiveWithTimeout(void* buffer,
-                                      size_t length,
-                                      TimeDelta timeout) {
-  AssertBlockingAllowed();
-  DCHECK_GT(length, 0u);
-  DCHECK_LE(length, kMaxMessageLength);
-  DCHECK_NE(handle_, kInvalidHandle);
-
-  // Only timeouts greater than zero and less than one second are allowed.
-  DCHECK_GT(timeout.InMicroseconds(), 0);
-  DCHECK_LT(timeout.InMicroseconds(),
-            TimeDelta::FromSeconds(1).InMicroseconds());
-
-  // Track the start time so we can reduce the timeout as data is read.
-  TimeTicks start_time = TimeTicks::Now();
-  const TimeTicks finish_time = start_time + timeout;
-
-  struct pollfd pollfd;
-  pollfd.fd = handle_;
-  pollfd.events = POLLIN;
-  pollfd.revents = 0;
-
-  size_t bytes_read_total = 0;
-  while (bytes_read_total < length) {
-    const TimeDelta this_timeout = finish_time - TimeTicks::Now();
-    const int timeout_ms =
-        static_cast<int>(this_timeout.InMillisecondsRoundedUp());
-    if (timeout_ms <= 0)
-      break;
-    const int poll_result = poll(&pollfd, 1, timeout_ms);
-    // Handle EINTR manually since we need to update the timeout value.
-    if (poll_result == -1 && errno == EINTR)
-      continue;
-    // Return if other type of error or a timeout.
-    if (poll_result <= 0)
-      return bytes_read_total;
-
-    // poll() only tells us that data is ready for reading, not how much.  We
-    // must Peek() for the amount ready for reading to avoid blocking.
-    // At hang up (POLLHUP), the write end has been closed and there might still
-    // be data to be read.
-    // No special handling is needed for error (POLLERR); we can let any of the
-    // following operations fail and handle it there.
-    DCHECK(pollfd.revents & (POLLIN | POLLHUP | POLLERR)) << pollfd.revents;
-    const size_t bytes_to_read = std::min(Peek(), length - bytes_read_total);
-
-    // There may be zero bytes to read if the socket at the other end closed.
-    if (!bytes_to_read)
-      return bytes_read_total;
-
-    const size_t bytes_received =
-        Receive(static_cast<char*>(buffer) + bytes_read_total, bytes_to_read);
-    bytes_read_total += bytes_received;
-    if (bytes_received != bytes_to_read)
-      return bytes_read_total;
-  }
-
-  return bytes_read_total;
-}
-
-size_t SyncSocket::Peek() {
-  DCHECK_NE(handle_, kInvalidHandle);
-  int number_chars = 0;
-  if (ioctl(handle_, FIONREAD, &number_chars) == -1) {
-    // If there is an error in ioctl, signal that the channel would block.
-    return 0;
-  }
-  DCHECK_GE(number_chars, 0);
-  return number_chars;
-}
-
-SyncSocket::Handle SyncSocket::Release() {
-  Handle r = handle_;
-  handle_ = kInvalidHandle;
-  return r;
-}
-
-CancelableSyncSocket::CancelableSyncSocket() = default;
-CancelableSyncSocket::CancelableSyncSocket(Handle handle)
-    : SyncSocket(handle) {
-}
-
-bool CancelableSyncSocket::Shutdown() {
-  DCHECK_NE(handle_, kInvalidHandle);
-  return HANDLE_EINTR(shutdown(handle_, SHUT_RDWR)) >= 0;
-}
-
-size_t CancelableSyncSocket::Send(const void* buffer, size_t length) {
-  DCHECK_GT(length, 0u);
-  DCHECK_LE(length, kMaxMessageLength);
-  DCHECK_NE(handle_, kInvalidHandle);
-
-  const int flags = fcntl(handle_, F_GETFL);
-  if (flags != -1 && (flags & O_NONBLOCK) == 0) {
-    // Set the socket to non-blocking mode for sending if its original mode
-    // is blocking.
-    fcntl(handle_, F_SETFL, flags | O_NONBLOCK);
-  }
-
-  const size_t len = SendHelper(handle_, buffer, length);
-
-  if (flags != -1 && (flags & O_NONBLOCK) == 0) {
-    // Restore the original flags.
-    fcntl(handle_, F_SETFL, flags);
-  }
-
-  return len;
-}
-
-// static
-bool CancelableSyncSocket::CreatePair(CancelableSyncSocket* socket_a,
-                                      CancelableSyncSocket* socket_b) {
-  return SyncSocket::CreatePair(socket_a, socket_b);
-}
-
-}  // namespace base
diff --git a/base/sync_socket_win.cc b/base/sync_socket_win.cc
deleted file mode 100644
index 905d0a2..0000000
--- a/base/sync_socket_win.cc
+++ /dev/null
@@ -1,356 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/sync_socket.h"
-
-#include <limits.h>
-#include <stddef.h>
-
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/rand_util.h"
-#include "base/threading/thread_restrictions.h"
-#include "base/win/scoped_handle.h"
-
-namespace base {
-
-using win::ScopedHandle;
-
-namespace {
-// IMPORTANT: do not change how this name is generated because it will break
-// in sandboxed scenarios as we might have by-name policies that allow pipe
-// creation. Also keep the secure random number generation.
-const wchar_t kPipeNameFormat[] = L"\\\\.\\pipe\\chrome.sync.%u.%u.%lu";
-const size_t kPipePathMax =  arraysize(kPipeNameFormat) + (3 * 10) + 1;
-
-// To avoid users sending negative message lengths to Send/Receive
-// we clamp message lengths, which are size_t, to no more than INT_MAX.
-const size_t kMaxMessageLength = static_cast<size_t>(INT_MAX);
-
-const int kOutBufferSize = 4096;
-const int kInBufferSize = 4096;
-const int kDefaultTimeoutMilliSeconds = 1000;
-
-bool CreatePairImpl(HANDLE* socket_a, HANDLE* socket_b, bool overlapped) {
-  DCHECK_NE(socket_a, socket_b);
-  DCHECK_EQ(*socket_a, SyncSocket::kInvalidHandle);
-  DCHECK_EQ(*socket_b, SyncSocket::kInvalidHandle);
-
-  wchar_t name[kPipePathMax];
-  ScopedHandle handle_a;
-  DWORD flags = PIPE_ACCESS_DUPLEX | FILE_FLAG_FIRST_PIPE_INSTANCE;
-  if (overlapped)
-    flags |= FILE_FLAG_OVERLAPPED;
-
-  do {
-    unsigned long rnd_name;
-    RandBytes(&rnd_name, sizeof(rnd_name));
-
-    swprintf(name, kPipePathMax,
-             kPipeNameFormat,
-             GetCurrentProcessId(),
-             GetCurrentThreadId(),
-             rnd_name);
-
-    handle_a.Set(CreateNamedPipeW(
-        name,
-        flags,
-        PIPE_TYPE_BYTE | PIPE_READMODE_BYTE,
-        1,
-        kOutBufferSize,
-        kInBufferSize,
-        kDefaultTimeoutMilliSeconds,
-        NULL));
-  } while (!handle_a.IsValid() &&
-           (GetLastError() == ERROR_PIPE_BUSY));
-
-  if (!handle_a.IsValid()) {
-    NOTREACHED();
-    return false;
-  }
-
-  // The SECURITY_ANONYMOUS flag means that the server side (handle_a) cannot
-  // impersonate the client (handle_b). This allows us not to care which side
-  // ends up in which side of a privilege boundary.
-  flags = SECURITY_SQOS_PRESENT | SECURITY_ANONYMOUS;
-  if (overlapped)
-    flags |= FILE_FLAG_OVERLAPPED;
-
-  ScopedHandle handle_b(CreateFileW(name,
-                                    GENERIC_READ | GENERIC_WRITE,
-                                    0,          // no sharing.
-                                    NULL,       // default security attributes.
-                                    OPEN_EXISTING,  // opens existing pipe.
-                                    flags,
-                                    NULL));     // no template file.
-  if (!handle_b.IsValid()) {
-    DPLOG(ERROR) << "CreateFileW failed";
-    return false;
-  }
-
-  if (!ConnectNamedPipe(handle_a.Get(), NULL)) {
-    DWORD error = GetLastError();
-    if (error != ERROR_PIPE_CONNECTED) {
-      DPLOG(ERROR) << "ConnectNamedPipe failed";
-      return false;
-    }
-  }
-
-  *socket_a = handle_a.Take();
-  *socket_b = handle_b.Take();
-
-  return true;
-}
-
-// Inline helper to avoid having the cast everywhere.
-DWORD GetNextChunkSize(size_t current_pos, size_t max_size) {
-  // The following statement is for 64 bit portability.
-  return static_cast<DWORD>(((max_size - current_pos) <= UINT_MAX) ?
-      (max_size - current_pos) : UINT_MAX);
-}
-
-// Template function that supports calling ReadFile or WriteFile in an
-// overlapped fashion and waits for IO completion.  The function also waits
-// on an event that can be used to cancel the operation.  If the operation
-// is cancelled, the function returns and closes the relevant socket object.
-template <typename BufferType, typename Function>
-size_t CancelableFileOperation(Function operation,
-                               HANDLE file,
-                               BufferType* buffer,
-                               size_t length,
-                               WaitableEvent* io_event,
-                               WaitableEvent* cancel_event,
-                               CancelableSyncSocket* socket,
-                               DWORD timeout_in_ms) {
-  AssertBlockingAllowed();
-  // The buffer must be byte size or the length check won't make much sense.
-  static_assert(sizeof(buffer[0]) == sizeof(char), "incorrect buffer type");
-  DCHECK_GT(length, 0u);
-  DCHECK_LE(length, kMaxMessageLength);
-  DCHECK_NE(file, SyncSocket::kInvalidHandle);
-
-  // Track the finish time so we can calculate the timeout as data is read.
-  TimeTicks current_time, finish_time;
-  if (timeout_in_ms != INFINITE) {
-    current_time = TimeTicks::Now();
-    finish_time =
-        current_time + base::TimeDelta::FromMilliseconds(timeout_in_ms);
-  }
-
-  size_t count = 0;
-  do {
-    // The OVERLAPPED structure will be modified by ReadFile or WriteFile.
-    OVERLAPPED ol = { 0 };
-    ol.hEvent = io_event->handle();
-
-    const DWORD chunk = GetNextChunkSize(count, length);
-    // This is either the ReadFile or WriteFile call depending on whether
-    // we're receiving or sending data.
-    DWORD len = 0;
-    const BOOL operation_ok = operation(
-        file, static_cast<BufferType*>(buffer) + count, chunk, &len, &ol);
-    if (!operation_ok) {
-      if (::GetLastError() == ERROR_IO_PENDING) {
-        HANDLE events[] = { io_event->handle(), cancel_event->handle() };
-        const int wait_result = WaitForMultipleObjects(
-            arraysize(events), events, FALSE,
-            timeout_in_ms == INFINITE ?
-                timeout_in_ms :
-                static_cast<DWORD>(
-                    (finish_time - current_time).InMilliseconds()));
-        if (wait_result != WAIT_OBJECT_0 + 0) {
-          // CancelIo() doesn't synchronously cancel outstanding IO, only marks
-          // outstanding IO for cancellation. We must call GetOverlappedResult()
-          // below to ensure in flight writes complete before returning.
-          CancelIo(file);
-        }
-
-        // We set the |bWait| parameter to TRUE for GetOverlappedResult() to
-        // ensure writes are complete before returning.
-        if (!GetOverlappedResult(file, &ol, &len, TRUE))
-          len = 0;
-
-        if (wait_result == WAIT_OBJECT_0 + 1) {
-          DVLOG(1) << "Shutdown was signaled. Closing socket.";
-          socket->Close();
-          return count;
-        }
-
-        // Timeouts will be handled by the while() condition below since
-        // GetOverlappedResult() may complete successfully after CancelIo().
-        DCHECK(wait_result == WAIT_OBJECT_0 + 0 || wait_result == WAIT_TIMEOUT);
-      } else {
-        break;
-      }
-    }
-
-    count += len;
-
-    // Quit the operation if we can't write/read anymore.
-    if (len != chunk)
-      break;
-
-    // Since TimeTicks::Now() is expensive, only bother updating the time if we
-    // have more work to do.
-    if (timeout_in_ms != INFINITE && count < length)
-      current_time = base::TimeTicks::Now();
-  } while (count < length &&
-           (timeout_in_ms == INFINITE || current_time < finish_time));
-
-  return count;
-}
-
-}  // namespace
-
-#if defined(COMPONENT_BUILD)
-const SyncSocket::Handle SyncSocket::kInvalidHandle = INVALID_HANDLE_VALUE;
-#endif
-
-SyncSocket::SyncSocket() : handle_(kInvalidHandle) {}
-
-SyncSocket::~SyncSocket() {
-  Close();
-}
-
-// static
-bool SyncSocket::CreatePair(SyncSocket* socket_a, SyncSocket* socket_b) {
-  return CreatePairImpl(&socket_a->handle_, &socket_b->handle_, false);
-}
-
-// static
-SyncSocket::Handle SyncSocket::UnwrapHandle(
-    const TransitDescriptor& descriptor) {
-  return descriptor;
-}
-
-bool SyncSocket::PrepareTransitDescriptor(ProcessHandle peer_process_handle,
-                                          TransitDescriptor* descriptor) {
-  DCHECK(descriptor);
-  if (!::DuplicateHandle(GetCurrentProcess(), handle(), peer_process_handle,
-                         descriptor, 0, FALSE, DUPLICATE_SAME_ACCESS)) {
-    DPLOG(ERROR) << "Cannot duplicate socket handle for peer process.";
-    return false;
-  }
-  return true;
-}
-
-bool SyncSocket::Close() {
-  if (handle_ == kInvalidHandle)
-    return true;
-
-  const BOOL result = CloseHandle(handle_);
-  handle_ = kInvalidHandle;
-  return result == TRUE;
-}
-
-size_t SyncSocket::Send(const void* buffer, size_t length) {
-  AssertBlockingAllowed();
-  DCHECK_GT(length, 0u);
-  DCHECK_LE(length, kMaxMessageLength);
-  DCHECK_NE(handle_, kInvalidHandle);
-  size_t count = 0;
-  while (count < length) {
-    DWORD len;
-    DWORD chunk = GetNextChunkSize(count, length);
-    if (::WriteFile(handle_, static_cast<const char*>(buffer) + count, chunk,
-                    &len, NULL) == FALSE) {
-      return count;
-    }
-    count += len;
-  }
-  return count;
-}
-
-size_t SyncSocket::ReceiveWithTimeout(void* buffer,
-                                      size_t length,
-                                      TimeDelta timeout) {
-  NOTIMPLEMENTED();
-  return 0;
-}
-
-size_t SyncSocket::Receive(void* buffer, size_t length) {
-  AssertBlockingAllowed();
-  DCHECK_GT(length, 0u);
-  DCHECK_LE(length, kMaxMessageLength);
-  DCHECK_NE(handle_, kInvalidHandle);
-  size_t count = 0;
-  while (count < length) {
-    DWORD len;
-    DWORD chunk = GetNextChunkSize(count, length);
-    if (::ReadFile(handle_, static_cast<char*>(buffer) + count, chunk, &len,
-                   NULL) == FALSE) {
-      return count;
-    }
-    count += len;
-  }
-  return count;
-}
-
-size_t SyncSocket::Peek() {
-  DWORD available = 0;
-  PeekNamedPipe(handle_, NULL, 0, NULL, &available, NULL);
-  return available;
-}
-
-SyncSocket::Handle SyncSocket::Release() {
-  Handle r = handle_;
-  handle_ = kInvalidHandle;
-  return r;
-}
-
-CancelableSyncSocket::CancelableSyncSocket()
-    : shutdown_event_(base::WaitableEvent::ResetPolicy::MANUAL,
-                      base::WaitableEvent::InitialState::NOT_SIGNALED),
-      file_operation_(base::WaitableEvent::ResetPolicy::MANUAL,
-                      base::WaitableEvent::InitialState::NOT_SIGNALED) {}
-
-CancelableSyncSocket::CancelableSyncSocket(Handle handle)
-    : SyncSocket(handle),
-      shutdown_event_(base::WaitableEvent::ResetPolicy::MANUAL,
-                      base::WaitableEvent::InitialState::NOT_SIGNALED),
-      file_operation_(base::WaitableEvent::ResetPolicy::MANUAL,
-                      base::WaitableEvent::InitialState::NOT_SIGNALED) {}
-
-bool CancelableSyncSocket::Shutdown() {
-  // This doesn't shut down the pipe immediately, but subsequent Receive or Send
-  // methods will fail straight away.
-  shutdown_event_.Signal();
-  return true;
-}
-
-bool CancelableSyncSocket::Close() {
-  const bool result = SyncSocket::Close();
-  shutdown_event_.Reset();
-  return result;
-}
-
-size_t CancelableSyncSocket::Send(const void* buffer, size_t length) {
-  static const DWORD kWaitTimeOutInMs = 500;
-  return CancelableFileOperation(
-      &::WriteFile, handle_, reinterpret_cast<const char*>(buffer), length,
-      &file_operation_, &shutdown_event_, this, kWaitTimeOutInMs);
-}
-
-size_t CancelableSyncSocket::Receive(void* buffer, size_t length) {
-  return CancelableFileOperation(
-      &::ReadFile, handle_, reinterpret_cast<char*>(buffer), length,
-      &file_operation_, &shutdown_event_, this, INFINITE);
-}
-
-size_t CancelableSyncSocket::ReceiveWithTimeout(void* buffer,
-                                                size_t length,
-                                                TimeDelta timeout) {
-  return CancelableFileOperation(&::ReadFile, handle_,
-                                 reinterpret_cast<char*>(buffer), length,
-                                 &file_operation_, &shutdown_event_, this,
-                                 static_cast<DWORD>(timeout.InMilliseconds()));
-}
-
-// static
-bool CancelableSyncSocket::CreatePair(CancelableSyncSocket* socket_a,
-                                      CancelableSyncSocket* socket_b) {
-  return CreatePairImpl(&socket_a->handle_, &socket_b->handle_, true);
-}
-
-}  // namespace base
diff --git a/build/gen.py b/build/gen.py
index 9e2ab8f..412fa9e 100755
--- a/build/gen.py
+++ b/build/gen.py
@@ -713,7 +713,6 @@
         'base/profiler/win32_stack_frame_unwinder.cc',
         'base/rand_util_win.cc',
         'base/strings/sys_string_conversions_win.cc',
-        'base/sync_socket_win.cc',
         'base/synchronization/condition_variable_win.cc',
         'base/synchronization/lock_impl_win.cc',
         'base/synchronization/waitable_event_watcher_win.cc',