Apply FINAL to the RenderObject hierarchy.

Source/core/rendering/RenderVideo.h

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 17 matching lines @@
 
 #if ENABLE(VIDEO)
 
 #include "RenderMedia.h"
 
 namespace WebCore {
     
 class HTMLMediaElement;
 class HTMLVideoElement;
 
-class RenderVideo : public RenderMedia {
+class RenderVideo FINAL : public RenderMedia {
 public:
     RenderVideo(HTMLVideoElement*);
     virtual ~RenderVideo();
 
     IntRect videoBox() const;
 
     static IntSize defaultSize();
 
     bool supportsAcceleratedRendering() const;
     void acceleratedRenderingStateChanged();
@@ skipping 39 matching lines @@
     return static_cast<RenderVideo*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderVideo(const RenderVideo*);
 
 } // namespace WebCore
 
 #endif
 #endif // RenderVideo_h