Fix GN bootstrap

tools/gn/bootstrap/bootstrap.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 # This file isn't officially supported by the Chromium project. It's maintained
 # on a best-effort basis by volunteers, so some things may be broken from time
 # to time. If you encounter errors, it's most often due to files in base that
 # have been added or moved since somebody last tried this script. Generally
 # such errors are easy to diagnose.
@@ skipping 273 matching lines @@
       'base/synchronization/lock.cc',
       'base/sys_info.cc',
       'base/task_runner.cc',
       'base/third_party/dmg_fp/dtoa_wrapper.cc',
       'base/third_party/dmg_fp/g_fmt.cc',
       'base/third_party/icu/icu_utf.cc',
       'base/third_party/nspr/prtime.cc',
       'base/thread_task_runner_handle.cc',
       'base/threading/non_thread_safe_impl.cc',
       'base/threading/post_task_and_reply_impl.cc',
+      'base/threading/sequenced_task_runner_handle.cc',
       'base/threading/sequenced_worker_pool.cc',
       'base/threading/simple_thread.cc',
       'base/threading/thread.cc',
       'base/threading/thread_checker_impl.cc',
       'base/threading/thread_collision_warner.cc',
       'base/threading/thread_id_name_manager.cc',
       'base/threading/thread_local_storage.cc',
       'base/threading/thread_restrictions.cc',
       'base/threading/worker_pool.cc',
       'base/time/time.cc',
@@ skipping 218 matching lines @@
     cmd.append('-v')
   cmd.append('gn')
   check_call(cmd)
 
   if not options.debug:
     check_call(['strip', os.path.join(build_dir, 'gn')])
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))