Fix GN bootstrap.

tools/gn/bootstrap/bootstrap.py

Index: tools/gn/bootstrap/bootstrap.py
diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index 38cfb117d29c3895291379f00d8dc8c8b0727474..75e2eb4cce3ae9554c0a25193712683ac221f6c0 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -384,6 +384,7 @@ def write_gn_ninja(path, root_gen_dir, options):
       'base/base_paths.cc',
       'base/base_switches.cc',
       'base/build_time.cc',
+      'base/callback_helpers.cc',
       'base/callback_internal.cc',
       'base/command_line.cc',
       'base/debug/activity_tracker.cc',
@@ -605,6 +606,7 @@ def write_gn_ninja(path, root_gen_dir, options):
         'base/allocator/allocator_shim.cc',
         'base/allocator/allocator_shim_default_dispatch_to_glibc.cc',
         'base/memory/shared_memory_posix.cc',
+        'base/memory/shared_memory_tracker.cc',
         'base/nix/xdg_util.cc',
         'base/process/internal_linux.cc',
         'base/process/memory_linux.cc',