Standardize usage of virtual/override/final in chrome/browser/ui/

chrome/browser/ui/webui/options/help_overlay_handler.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_WEBUI_OPTIONS_HELP_OVERLAY_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_HELP_OVERLAY_HANDLER_H_
 
 #include "base/basictypes.h"
 #include "base/macros.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
 
 namespace options {
 
 // Help UI page handler to support About in Settings when using Settings in a
 // window. Defers to ::HelpHandler.
 class HelpOverlayHandler : public ::options::OptionsPageUIHandler {
  public:
   HelpOverlayHandler();
-  virtual ~HelpOverlayHandler();
+  ~HelpOverlayHandler() override;
 
   // OptionsPageUIHandler implementation.
-  virtual void GetLocalizedValues(
-      base::DictionaryValue* localized_strings) override;
+  void GetLocalizedValues(base::DictionaryValue* localized_strings) override;
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages() override;
+  void RegisterMessages() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HelpOverlayHandler);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_HELP_OVERLAY_HANDLER_H_