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

chrome/browser/ui/webui/chromeos/nfc_debug_ui.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_CHROMEOS_NFC_DEBUG_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_CHROMEOS_NFC_DEBUG_UI_H_
 
 #include "content/public/browser/web_ui_controller.h"
 
 namespace chromeos {
 
 class NfcDebugUI : public content::WebUIController {
  public:
   explicit NfcDebugUI(content::WebUI* web_ui);
-  virtual ~NfcDebugUI();
+  ~NfcDebugUI() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NfcDebugUI);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CHROMEOS_NFC_DEBUG_UI_H_