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

chrome/browser/chromeos/login/ui/models/user_board_model.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_CHROMEOS_LOGIN_UI_MODELS_USER_BOARD_MODEL_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_MODELS_USER_BOARD_MODEL_H_
 
 #include "chrome/browser/chromeos/login/screens/base_screen.h"
 
 namespace chromeos {
 
 class UserBoardModel : public BaseScreen {
  public:
   UserBoardModel();
-  virtual ~UserBoardModel();
+  ~UserBoardModel() override;
 
   // Build list of users and send it to the webui.
   virtual void SendUserList() = 0;
 
   // Methods for easy unlock support.
   virtual void HardLockPod(const std::string& user_id) = 0;
   virtual void AttemptEasyUnlock(const std::string& user_id) = 0;
 
   // BaseScreen implementation:
-  virtual std::string GetName() const override;
+  std::string GetName() const override;
 
   // Temorary unused methods:
-  virtual void PrepareToShow() override{};
-  virtual void Show() override{};
-  virtual void Hide() override{};
+  void PrepareToShow() override{};
+  void Show() override{};
+  void Hide() override{};
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_MODELS_USER_BOARD_MODEL_H_