Restrict memory maps dump provider to only android and linux

The memory maps dump provider is used only in android and linux, and
not yet supported in windows. So, this should be compiled only in linux
and android.

BUG=461788

Review URL: https://codereview.chromium.org/1391933002

Cr-Original-Commit-Position: refs/heads/master@{#353029}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: cf0bd979e8594b8fe369ed3177038cb06c05f05b

tools/gn/bootstrap/bootstrap.py

diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index 8764f0d..53845c2 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -250,7 +250,6 @@
       'base/trace_event/memory_profiler_allocation_context.cc',
       'base/trace_event/process_memory_dump.cc',
       'base/trace_event/process_memory_maps.cc',
-      'base/trace_event/process_memory_maps_dump_provider.cc',
       'base/trace_event/process_memory_totals.cc',
       'base/trace_event/process_memory_totals_dump_provider.cc',
       'base/trace_event/trace_buffer.cc',
@@ -338,6 +337,7 @@
         'base/sys_info_linux.cc',
         'base/threading/platform_thread_linux.cc',
         'base/trace_event/malloc_dump_provider.cc',
+        'base/trace_event/process_memory_maps_dump_provider.cc',
     ])
     static_libraries['libevent']['include_dirs'].extend([
         os.path.join(SRC_ROOT, 'third_party', 'libevent', 'linux')