Add shutdown notification and service refs to SyncServiceObserver.

components/sync/driver/sync_error_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_SYNC_DRIVER_SYNC_ERROR_CONTROLLER_H_
 #define COMPONENTS_SYNC_DRIVER_SYNC_ERROR_CONTROLLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
@@ skipping 17 matching lines @@
   explicit SyncErrorController(SyncService* service);
   ~SyncErrorController() override;
 
   // True if there exists an error worth elevating to the user.
   bool HasError();
 
   void AddObserver(Observer* observer);
   void RemoveObserver(Observer* observer);
 
   // SyncServiceObserver:
-  void OnStateChanged() override;
+  void OnStateChanged(syncer::SyncService* sync) override;
 
  private:
   SyncService* service_;
   base::ObserverList<Observer, true> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncErrorController);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_DRIVER_SYNC_ERROR_CONTROLLER_H_