Add shutdown notification and service refs to SyncServiceObserver.

chrome/browser/ui/webui/settings/settings_clear_browsing_data_handler.h

 // Copyright 2015 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_SETTINGS_SETTINGS_CLEAR_BROWSING_DATA_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_CLEAR_BROWSING_DATA_HANDLER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
@@ skipping 38 matching lines @@
 
   // Called when a clearing task finished. |webui_callback_id| is provided
   // by the WebUI action that initiated it.
   void OnClearingTaskFinished(const std::string& webui_callback_id);
 
   // Initializes the dialog UI. Called by JavaScript when the DOM is ready.
   void HandleInitialize(const base::ListValue* args);
 
   // Implementation of SyncServiceObserver. Updates the footer of the dialog
   // when the sync state changes.
-  void OnStateChanged() override;
+  void OnStateChanged(syncer::SyncService* sync) override;
 
   // Finds out whether we should show notice about other forms of history stored
   // in user's account.
   void RefreshHistoryNotice();
 
   // Called as an asynchronous response to |RefreshHistoryNotice()|. Shows or
   // hides the footer about other forms of history stored in user's account.
   void UpdateHistoryNotice(bool show);
 
   // Called as an asynchronous response to |RefreshHistoryNotice()|. Enables or
@@ skipping 33 matching lines @@
 
   // A weak pointer factory for asynchronous calls referencing this class.
   base::WeakPtrFactory<ClearBrowsingDataHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ClearBrowsingDataHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_SETTINGS_CLEAR_BROWSING_DATA_HANDLER_H_