Add shutdown notification and service refs to SyncServiceObserver.

components/history/core/browser/history_delete_directives_data_type_controller.h

 // 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.
 
 #ifndef COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_DELETE_DIRECTIVES_DATA_TYPE_CONTROLLER_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_DELETE_DIRECTIVES_DATA_TYPE_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "components/sync/device_info/local_device_info_provider.h"
 #include "components/sync/driver/async_directory_type_controller.h"
@@ skipping 11 matching lines @@
   HistoryDeleteDirectivesDataTypeController(const base::Closure& dump_stack,
                                             syncer::SyncClient* sync_client);
   ~HistoryDeleteDirectivesDataTypeController() override;
 
   // AsyncDirectoryTypeController override.
   bool ReadyForStart() const override;
   bool StartModels() override;
   void StopModels() override;
 
   // syncer::SyncServiceObserver implementation.
-  void OnStateChanged() override;
+  void OnStateChanged(syncer::SyncService* sync) override;
 
  private:
   // Triggers a SingleDataTypeUnrecoverable error and returns true if the
   // type is no longer ready, else does nothing and returns false.
   bool DisableTypeIfNecessary();
 
   syncer::SyncClient* sync_client_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryDeleteDirectivesDataTypeController);
 };
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_DELETE_DIRECTIVES_DATA_TYPE_CONTROLLER_H_