Add shutdown notification and service refs to SyncServiceObserver.

chrome/browser/ui/ash/app_sync_ui_state.cc

 // 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.
 
 #include "chrome/browser/ui/ash/app_sync_ui_state.h"
 
 #include "build/build_config.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/pending_extension_manager.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 114 matching lines @@
   if (synced && !has_pending_extension)
     SetStatus(STATUS_NORMAL);
   else
     SetStatus(STATUS_SYNCING);
 }
 
 void AppSyncUIState::OnMaxSyncingTimer() {
   SetStatus(STATUS_TIMED_OUT);
 }
 
-void AppSyncUIState::OnStateChanged() {
+void AppSyncUIState::OnStateChanged(syncer::SyncService* sync) {
   DCHECK(sync_service_);
   CheckAppSync();
 }
 
 void AppSyncUIState::OnExtensionLoaded(content::BrowserContext* browser_context,
                                        const extensions::Extension* extension) {
   CheckAppSync();
 }