Update {virtual,override,final} to follow C++11 style chrome/browser/ui/webui/chromeos.

chrome/browser/ui/webui/chromeos/slow_ui.cc

 // 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.
 
 #include "chrome/browser/ui/webui/chromeos/slow_ui.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/prefs/pref_change_registrar.h"
@@ skipping 39 matching lines @@
   source->SetJsonPath("strings.js");
   source->AddResourcePath("slow.js", IDR_SLOW_JS);
   source->SetDefaultResource(IDR_SLOW_HTML);
   return source;
 }
 
 // The handler for Javascript messages related to the "slow" view.
 class SlowHandler : public WebUIMessageHandler {
  public:
   explicit SlowHandler(Profile* profile);
-  virtual ~SlowHandler();
+  ~SlowHandler() override;
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages() override;
+  void RegisterMessages() override;
 
  private:
   void UpdatePage();
 
   // Handlers for JS WebUI messages.
   void HandleDisable(const base::ListValue* args);
   void HandleEnable(const base::ListValue* args);
   void LoadComplete(const base::ListValue* args);
 
   Profile* profile_;
@@ skipping 53 matching lines @@
 
   SlowHandler* handler = new SlowHandler(profile);
   web_ui->AddMessageHandler(handler);
 
   // Set up the chrome://slow/ source.
   content::WebUIDataSource::Add(profile, CreateSlowUIHTMLSource());
 }
 
 }  // namespace chromeos