Standardize usage of virtual/override/final in content/

content/shell/renderer/shell_render_view_observer.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 CONTENT_SHELL_SHELL_RENDER_VIEW_OBSERVER_H_
 #define CONTENT_SHELL_SHELL_RENDER_VIEW_OBSERVER_H_
 
 #include <string>
 #include "base/memory/scoped_ptr.h"
 #include "content/public/renderer/render_view_observer.h"
 
 namespace blink {
 class WebFrame;
 }
 
 namespace content {
 
 class IPCEcho;
 class RenderView;
 
 
 class ShellRenderViewObserver : public RenderViewObserver {
  public:
   explicit ShellRenderViewObserver(RenderView* render_view);
-  virtual ~ShellRenderViewObserver();
+  ~ShellRenderViewObserver() override;
 
  private:
   // Message handlers.
   void OnEchoPong(int id, const std::string& body);
 
   // RenderViewObserver implementation.
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
-  virtual void DidClearWindowObject(blink::WebLocalFrame* frame) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
+  void DidClearWindowObject(blink::WebLocalFrame* frame) override;
 
   scoped_ptr<IPCEcho> ipc_echo_;
   DISALLOW_COPY_AND_ASSIGN(ShellRenderViewObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_SHELL_SHELL_RENDER_VIEW_OBSERVER_H_