Add shutdown notification and service refs to SyncServiceObserver.

chrome/browser/sync_file_system/sync_file_system_service.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/sync_file_system/sync_file_system_service.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
@@ skipping 710 matching lines @@
     content::BrowserContext* browser_context,
     const Extension* extension) {
   GURL app_origin = Extension::GetBaseURLFromExtensionId(extension->id());
   DVLOG(1) << "Handle extension notification for LOADED: " << app_origin;
   remote_service_->EnableOrigin(
       app_origin,
       base::Bind(&DidHandleLoadEvent, app_origin));
   local_service_->SetOriginEnabled(app_origin, true);
 }
 
-void SyncFileSystemService::OnStateChanged() {
-  syncer::SyncService* profile_sync_service =
-      ProfileSyncServiceFactory::GetSyncServiceForBrowserContext(profile_);
-  if (profile_sync_service)
-    UpdateSyncEnabledStatus(profile_sync_service);
+void SyncFileSystemService::OnStateChanged(syncer::SyncService* sync) {
+  UpdateSyncEnabledStatus(sync);
 }
 
 void SyncFileSystemService::OnFileStatusChanged(
     const FileSystemURL& url,
     SyncFileType file_type,
     SyncFileStatus sync_status,
     SyncAction action_taken,
     SyncDirection direction) {
   for (auto& observer : observers_)
     observer.OnFileSynced(url, file_type, sync_status, action_taken, direction);
@@ skipping 17 matching lines @@
            local_sync_runners_.begin();
        iter != local_sync_runners_.end(); ++iter)
     ((*iter)->*method)();
   for (ScopedVector<SyncProcessRunner>::iterator iter =
            remote_sync_runners_.begin();
        iter != remote_sync_runners_.end(); ++iter)
     ((*iter)->*method)();
 }
 
 }  // namespace sync_file_system