MD Settings: Convert C++ handlers to be JavaScript-lifecycle aware.

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

 // Copyright 2013 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_RESET_SETTINGS_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SETTINGS_RESET_SETTINGS_HANDLER_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 24 matching lines @@
 //  2) 'Powerwash' dialog (ChromeOS only)
 class ResetSettingsHandler : public SettingsPageUIHandler {
  public:
   ~ResetSettingsHandler() override;
 
   static ResetSettingsHandler* Create(
       content::WebUIDataSource* html_source, Profile* profile);
 
   // WebUIMessageHandler implementation.
   void RegisterMessages() override;
+  void OnJavascriptAllowed() override {}
+  void OnJavascriptDisallowed() override {}
 
  protected:
   ResetSettingsHandler(Profile* profile, bool allow_powerwash);
 
   // Overriden in tests to substitute with a test version of ProfileResetter.
   virtual ProfileResetter* GetResetter();
 
   // Javascript callback to start clearing data.
   void HandleResetProfileSettings(const base::ListValue* args);
 
@@ skipping 49 matching lines @@
   std::string brandcode_;
 
   base::WeakPtrFactory<ResetSettingsHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ResetSettingsHandler);
 };
 
 }  // namespace settings
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SETTINGS_RESET_SETTINGS_HANDLER_H_