Add shutdown notification and service refs to SyncServiceObserver.

chrome/browser/ui/ash/app_sync_ui_state.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 CHROME_BROWSER_UI_ASH_APP_SYNC_UI_STATE_H_
 #define CHROME_BROWSER_UI_ASH_APP_SYNC_UI_STATE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
@@ skipping 53 matching lines @@
 
   // Checks and sets app sync status. If sync has not setup, do nothing. If sync
   // is completed and there is no pending synced extension install, sets
   // STATUS_SYNCING. Otherwise, sets STATUS_NORMAL.
   void CheckAppSync();
 
   // Invoked when |max_syncing_status_timer_| fires.
   void OnMaxSyncingTimer();
 
   // syncer::SyncServiceObserver overrides:
-  void OnStateChanged() override;
+  void OnStateChanged(syncer::SyncService* sync) override;
 
   // extensions::ExtensionRegistryObserver overrides:
   void OnExtensionLoaded(content::BrowserContext* browser_context,
                          const extensions::Extension* extension) override;
 
   Profile* profile_;
   browser_sync::ProfileSyncService* sync_service_;
 
   // Timer to limit how much time STATUS_SYNCING is allowed.
   base::OneShotTimer max_syncing_status_timer_;
 
   Status status_;
   base::ObserverList<AppSyncUIStateObserver> observers_;
 
   extensions::ExtensionRegistry* extension_registry_;
 
   DISALLOW_COPY_AND_ASSIGN(AppSyncUIState);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_APP_SYNC_UI_STATE_H_