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

android_webview/renderer/aw_render_process_observer.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 ANDROID_WEBVIEW_RENDERER_AW_RENDER_PROCESS_OBSERVER_H_
 #define ANDROID_WEBVIEW_RENDERER_AW_RENDER_PROCESS_OBSERVER_H_
 
 #include "content/public/renderer/render_process_observer.h"
 
 #include "base/compiler_specific.h"
 
 namespace android_webview {
 
 // A RenderProcessObserver implementation used for handling android_webview
 // specific render-process wide IPC messages.
 class AwRenderProcessObserver : public content::RenderProcessObserver {
  public:
   AwRenderProcessObserver();
-  virtual ~AwRenderProcessObserver();
+  ~AwRenderProcessObserver() override;
 
   // content::RenderProcessObserver implementation.
-  virtual bool OnControlMessageReceived(const IPC::Message& message) override;
-  virtual void WebKitInitialized() override;
+  bool OnControlMessageReceived(const IPC::Message& message) override;
+  void WebKitInitialized() override;
 
  private:
   void OnClearCache();
   void OnSetJsOnlineProperty(bool network_up);
 
   bool webkit_initialized_;
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_RENDERER_AW_RENDER_PROCESS_OBSERVER_H_