Apply FINAL to the RenderObject hierarchy.

Source/core/rendering/RenderFullScreen.cpp

 /*
  * Copyright (C) 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 13 matching lines @@
 
 #include "config.h"
 
 #include "RenderFullScreen.h"
 
 #include "RenderLayer.h"
 #include "RenderLayerCompositor.h"
 
 using namespace WebCore;
 
-class RenderFullScreenPlaceholder : public RenderBlock {
+class RenderFullScreenPlaceholder FINAL : public RenderBlock {
 public:
     RenderFullScreenPlaceholder(RenderFullScreen* owner) 
         : RenderBlock(0)
         , m_owner(owner) 
     {
         setDocumentForAnonymous(owner->document());
     }
 private:
     virtual bool isRenderFullScreenPlaceholder() const { return true; }
     virtual void willBeDestroyed();
@@ skipping 133 matching lines @@
     if (!m_placeholder) {
         m_placeholder = new (document()->renderArena()) RenderFullScreenPlaceholder(this);
         m_placeholder->setStyle(style);
         if (parent()) {
             parent()->addChild(m_placeholder, this);
             parent()->setNeedsLayoutAndPrefWidthsRecalc();
         }
     } else
         m_placeholder->setStyle(style);
 }