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

content/browser/screen_orientation/screen_orientation_message_filter_android.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 CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_MESSAGE_FILTER_ANDROID_H_
 #define CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_MESSAGE_FILTER_ANDROID_H_
 
 #include "content/public/browser/browser_message_filter.h"
 
 namespace content {
 
 class ScreenOrientationMessageFilterAndroid : public BrowserMessageFilter {
  public:
   ScreenOrientationMessageFilterAndroid();
 
   // BrowserMessageFilter implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
-  virtual ~ScreenOrientationMessageFilterAndroid();
+  ~ScreenOrientationMessageFilterAndroid() override;
 
   void OnStartListening();
   void OnStopListening();
 
   int listeners_count_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenOrientationMessageFilterAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SCREEN_ORIENTATION_SCREEN_ORIENTATION_MESSAGE_FILTER_ANDROID_H_