Add shutdown notification and service refs to SyncServiceObserver.

chrome/browser/ui/sync/one_click_signin_sync_observer.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 CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_OBSERVER_H_
 #define CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_OBSERVER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "components/sync/driver/sync_service_observer.h"
@@ skipping 19 matching lines @@
 
  protected:
   // Exposed for testing.
   ~OneClickSigninSyncObserver() override;
 
  private:
   // content::WebContentsObserver:
   void WebContentsDestroyed() override;
 
   // syncer::SyncServiceObserver:
-  void OnStateChanged() override;
+  void OnStateChanged(syncer::SyncService* sync) override;
 
   // Loads the |continue_url_| in the |web_contents()|.
   void LoadContinueUrl();
 
   // Returns the ProfileSyncService associated with the |web_contents|.
   // The returned value may be NULL.
   browser_sync::ProfileSyncService* GetSyncService(
       content::WebContents* web_contents);
 
   // Deletes the |observer|. Intended to be used as a callback for base::Bind.
   static void DeleteObserver(
       base::WeakPtr<OneClickSigninSyncObserver> observer);
 
   // The URL to redirect to once Sync is initialized.
   const GURL continue_url_;
 
   base::WeakPtrFactory<OneClickSigninSyncObserver> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OneClickSigninSyncObserver);
 };
 
 #endif  // CHROME_BROWSER_UI_SYNC_ONE_CLICK_SIGNIN_SYNC_OBSERVER_H_