Merge duplicate code in invalidation helper.

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 52 matching lines @@
         'sync_driver/generic_change_processor.cc',
         'sync_driver/generic_change_processor.h',
         'sync_driver/generic_change_processor_factory.cc',
         'sync_driver/generic_change_processor_factory.h',
         'sync_driver/glue/synced_session.cc',
         'sync_driver/glue/synced_session.h',
         'sync_driver/glue/typed_url_model_associator.cc',
         'sync_driver/glue/typed_url_model_associator.h',
         'sync_driver/invalidation_adapter.cc',
         'sync_driver/invalidation_adapter.h',
-        'sync_driver/invalidation_helper.cc',
-        'sync_driver/invalidation_helper.h',
         'sync_driver/local_device_info_provider.h',
         'sync_driver/model_association_manager.cc',
         'sync_driver/model_association_manager.h',
         'sync_driver/model_associator.h',
         'sync_driver/non_blocking_data_type_controller.cc',
         'sync_driver/non_blocking_data_type_controller.h',
         'sync_driver/non_blocking_data_type_manager.cc',
         'sync_driver/non_blocking_data_type_manager.h',
         'sync_driver/non_ui_data_type_controller.cc',
         'sync_driver/non_ui_data_type_controller.h',
@@ skipping 99 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',
       ],
     },
   ],
 }