Update GN bootstrap to reflect the latest changes in //base.

TBR=brettw@chromium.org

Review-Url: https://codereview.chromium.org/2416853004
Cr-Original-Commit-Position: refs/heads/master@{#425169}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 9ed58da93e8cae421d5cdf37addfa1ec471431c8
diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index 5db0f3a..9fc1c76 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -498,7 +498,6 @@
       'base/trace_event/process_memory_totals.cc',
       'base/trace_event/trace_buffer.cc',
       'base/trace_event/trace_config.cc',
-      'base/trace_event/trace_event.cc',
       'base/trace_event/trace_event_argument.cc',
       'base/trace_event/trace_event_impl.cc',
       'base/trace_event/trace_event_memory_overhead.cc',
@@ -536,7 +535,6 @@
         'base/sys_info_posix.cc',
         'base/threading/platform_thread_internal_posix.cc',
         'base/threading/platform_thread_posix.cc',
-        'base/threading/thread_local_posix.cc',
         'base/threading/thread_local_storage_posix.cc',
         'base/threading/worker_pool_posix.cc',
         'base/time/time_posix.cc',