Add shutdown notification and service refs to SyncServiceObserver.

chrome/browser/ui/webui/options/clear_browser_data_handler.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_WEBUI_OPTIONS_CLEAR_BROWSER_DATA_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_CLEAR_BROWSER_DATA_HANDLER_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 41 matching lines @@
 
   // Adds a |counter| for browsing data.
   void AddCounter(std::unique_ptr<browsing_data::BrowsingDataCounter> counter);
 
   // Updates a counter in the UI according to the |result|.
   void UpdateCounterText(
       std::unique_ptr<browsing_data::BrowsingDataCounter::Result> result);
 
   // Implementation of SyncServiceObserver. Updates the support string at the
   // bottom of the dialog.
-  void OnStateChanged() override;
+  void OnStateChanged(syncer::SyncService* sync) override;
 
   // Finds out whether we should show a notice informing the user about other
   // forms of browsing history. Responds with an asynchronous callback to
   // |UpdateHistoryNotice|.
   void RefreshHistoryNotice();
 
   // Shows or hides the notice about other forms of browsing history.
   void UpdateHistoryNotice(bool show);
 
   // Remembers whether we should popup a dialog about other forms of browsing
@@ skipping 24 matching lines @@
 
   // A weak pointer factory for asynchronous calls referencing this class.
   base::WeakPtrFactory<ClearBrowserDataHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ClearBrowserDataHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_CLEAR_BROWSER_DATA_HANDLER_H_