Componentize protocol_event_observer

components/sync_driver.gypi

 # 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.
 
 {
   'targets': [
     {
       # GN version: //components/sync_driver
       'target_name': 'sync_driver',
       'type': 'static_library',
@@ skipping 50 matching lines @@
         'sync_driver/non_ui_data_type_controller.cc',
         'sync_driver/non_ui_data_type_controller.h',
         'sync_driver/open_tabs_ui_delegate.cc',
         'sync_driver/open_tabs_ui_delegate.h',
         'sync_driver/pref_names.cc',
         'sync_driver/pref_names.h',
         'sync_driver/profile_sync_auth_provider.cc',
         'sync_driver/profile_sync_auth_provider.h',
         'sync_driver/proxy_data_type_controller.cc',
         'sync_driver/proxy_data_type_controller.h',
+        'sync_driver/protocol_event_observer.cc',
+        'sync_driver/protocol_event_observer.h',
         'sync_driver/shared_change_processor.cc',
         'sync_driver/shared_change_processor.h',
         'sync_driver/shared_change_processor_ref.cc',
         'sync_driver/shared_change_processor_ref.h',
         'sync_driver/sync_api_component_factory.h',
         'sync_driver/sync_frontend.cc',
         'sync_driver/sync_frontend.h',
         'sync_driver/sync_prefs.cc',
         'sync_driver/sync_prefs.h',
         'sync_driver/sync_service.h',
@@ skipping 49 matching lines @@
         'sync_driver/local_device_info_provider_mock.cc',
         'sync_driver/local_device_info_provider_mock.h',
         'sync_driver/model_associator_mock.cc',
         'sync_driver/model_associator_mock.h',
         'sync_driver/non_ui_data_type_controller_mock.cc',
         'sync_driver/non_ui_data_type_controller_mock.h',
       ],
     },
   ],
 }