Fix the build dependency of ProfileSyncService on sync.pb.h

components/browser_sync.gypi

 # Copyright 2015 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.
 
 {
   'targets': [
     {
       # GN version: //components/browser_sync_browser
       'target_name': 'browser_sync_browser',
       'type': 'static_library',
@@ skipping 20 matching lines @@
         'syncable_prefs',
         'sync_bookmarks',
         'sync_driver',
         'sync_sessions',
         'variations',
         'version_info',
       ],
       'include_dirs': [
         '..',
       ],
+      'export_dependent_settings': [
+        'sync_driver',
+      ],
       'sources': [
         # Note: file list duplicated in GN build.
         'browser_sync/browser/profile_sync_components_factory_impl.cc',
         'browser_sync/browser/profile_sync_components_factory_impl.h',
         'browser_sync/browser/profile_sync_service.cc',
         'browser_sync/browser/profile_sync_service.h',
         'browser_sync/browser/signin_confirmation_helper.cc',
         'browser_sync/browser/signin_confirmation_helper.h',
       ],
     },
@@ skipping 48 matching lines @@
         'browser_sync/browser/profile_sync_test_util.cc',
         'browser_sync/browser/profile_sync_test_util.h',
         'browser_sync/browser/test_http_bridge_factory.cc',
         'browser_sync/browser/test_http_bridge_factory.h',
         'browser_sync/browser/test_profile_sync_service.cc',
         'browser_sync/browser/test_profile_sync_service.h',
       ],
     }
   ],
 }