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

chrome/browser/chromeos/login/enrollment/mock_enrollment_screen.h

 // Copyright (c) 2012 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_ENROLLMENT_MOCK_ENROLLMENT_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_MOCK_ENROLLMENT_SCREEN_H_
 
 #include "chrome/browser/chromeos/login/enrollment/enrollment_screen.h"
 #include "chrome/browser/chromeos/login/enrollment/enrollment_screen_actor.h"
 #include "chrome/browser/chromeos/policy/enrollment_config.h"
 #include "chrome/browser/chromeos/policy/enrollment_status_chromeos.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace chromeos {
 
 class MockEnrollmentScreen : public EnrollmentScreen {
  public:
   MockEnrollmentScreen(BaseScreenDelegate* base_screen_delegate,
                        EnrollmentScreenActor* actor);
-  virtual ~MockEnrollmentScreen();
+  ~MockEnrollmentScreen() override;
 };
 
 class MockEnrollmentScreenActor
     : public EnrollmentScreenActor {
  public:
   MockEnrollmentScreenActor();
   virtual ~MockEnrollmentScreenActor();
 
   MOCK_METHOD2(SetParameters,
                void(Controller*, const policy::EnrollmentConfig& config));
   MOCK_METHOD0(PrepareToShow, void());
   MOCK_METHOD0(Show, void());
   MOCK_METHOD0(Hide, void());
   MOCK_METHOD0(ShowSigninScreen, void());
   MOCK_METHOD0(ShowEnrollmentSpinnerScreen, void());
   MOCK_METHOD1(ShowAuthError, void(const GoogleServiceAuthError&));
   MOCK_METHOD1(ShowOtherError, void(EnterpriseEnrollmentHelper::OtherError));
   MOCK_METHOD1(ShowEnrollmentStatus, void(policy::EnrollmentStatus status));
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_MOCK_ENROLLMENT_SCREEN_H_