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

chrome/browser/chromeos/ui/screen_capture_notification_ui_chromeos.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_UI_SCREEN_CAPTURE_NOTIFICATION_UI_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_UI_SCREEN_CAPTURE_NOTIFICATION_UI_CHROMEOS_H_
 
 #include "base/observer_list.h"
 #include "chrome/browser/ui/screen_capture_notification_ui.h"
 
 namespace chromeos {
 
 // Chromeos implementation for ScreenCaptureNotificationUI.
 class ScreenCaptureNotificationUIChromeOS : public ScreenCaptureNotificationUI {
  public:
   // |text| is used to specify the text for the notification.
   explicit ScreenCaptureNotificationUIChromeOS(const base::string16& text);
-  virtual ~ScreenCaptureNotificationUIChromeOS();
+  ~ScreenCaptureNotificationUIChromeOS() override;
 
   // ScreenCaptureNotificationUI overrides.
-  virtual gfx::NativeViewId OnStarted(const base::Closure& stop_callback)
-      override;
+  gfx::NativeViewId OnStarted(const base::Closure& stop_callback) override;
 
  private:
   const base::string16 text_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenCaptureNotificationUIChromeOS);
 };
 
 }  // namespace chromeos
 #endif  // CHROME_BROWSER_CHROMEOS_UI_SCREEN_CAPTURE_NOTIFICATION_UI_CHROMEOS_H_