Add shutdown notification and service refs to SyncServiceObserver.

components/browser_sync/profile_sync_service.h

 // Copyright (c) 2012 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_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 #define COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_
 
 #include <memory>
 #include <set>
 #include <string>
@@ skipping 637 matching lines @@
   // refresh token. This happens when a new OAuth2 login token is loaded and
   // when sync server returns AUTH_ERROR which indicates it is time to refresh
   // token.
   void RequestAccessToken();
 
   // Sets the last synced time to the current time.
   void UpdateLastSyncedTime();
 
   void NotifySyncCycleCompleted();
   void NotifyForeignSessionUpdated();
+  void NotifyShutdown();
 
   void ClearStaleErrors();
 
   void ClearUnrecoverableError();
 
   // Starts up the engine sync components.
   virtual void StartUpSlowEngineComponents();
 
   // Collects preferred sync data types from |preference_providers_|.
   syncer::ModelTypeSet GetDataTypesFromPreferenceProviders() const;
@@ skipping 223 matching lines @@
   base::WeakPtrFactory<ProfileSyncService> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };
 
 bool ShouldShowActionOnUI(const syncer::SyncProtocolError& error);
 
 }  // namespace browser_sync
 
 #endif  // COMPONENTS_BROWSER_SYNC_PROFILE_SYNC_SERVICE_H_