Update {virtual,override} to follow C++11 style in chrome.

chrome/browser/chromeos/login/enrollment/mock_auto_enrollment_check_screen.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_ENROLLMENT_MOCK_AUTO_ENROLLMENT_CHECK_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_MOCK_AUTO_ENROLLMENT_CHECK_SCREEN_H_
 
 #include "chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen.h"
 #include "chrome/browser/chromeos/login/enrollment/auto_enrollment_check_screen_actor.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace chromeos {
 
 class MockAutoEnrollmentCheckScreen : public AutoEnrollmentCheckScreen {
  public:
   MockAutoEnrollmentCheckScreen(BaseScreenDelegate* base_screen_delegate,
                                 AutoEnrollmentCheckScreenActor* actor);
   ~MockAutoEnrollmentCheckScreen() override;
 };
 
 class MockAutoEnrollmentCheckScreenActor
     : public AutoEnrollmentCheckScreenActor {
  public:
   MockAutoEnrollmentCheckScreenActor();
-  virtual ~MockAutoEnrollmentCheckScreenActor();
+  ~MockAutoEnrollmentCheckScreenActor() override;
 
-  virtual void SetDelegate(Delegate* screen) override;
+  void SetDelegate(Delegate* screen) override;
 
   MOCK_METHOD1(MockSetDelegate, void(Delegate* screen));
   MOCK_METHOD0(Show, void());
 
  private:
   Delegate* screen_;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_MOCK_AUTO_ENROLLMENT_CHECK_SCREEN_H_