--- tools/gn/bootstrap/bootstrap.py.orig
+++ tools/gn/bootstrap/bootstrap.py
@@ -383,6 +383,7 @@
       'base/base_switches.cc',
       'base/build_time.cc',
       'base/callback_internal.cc',
+      'base/callback_helpers.cc',
       'base/command_line.cc',
       'base/debug/activity_tracker.cc',
       'base/debug/alias.cc',