Apply FINAL to the RenderObject hierarchy.

Source/core/rendering/RenderFullScreen.h

 /*
  * 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 12 matching lines @@
  */
 
 #ifndef RenderFullScreen_h
 #define RenderFullScreen_h
 
 #include "RenderFlexibleBox.h"
 #include "StyleInheritedData.h"
 
 namespace WebCore {
 
+// FIXME: make FINAL once MemoryInstrumentation does not use inheritance.
 class RenderFullScreen : public RenderFlexibleBox {
 public:
     static RenderFullScreen* createAnonymous(Document*);
 
     virtual bool isRenderFullScreen() const { return true; }
     virtual const char* renderName() const { return "RenderFullScreen"; }
 
     void setPlaceholder(RenderBlock*);
     RenderBlock* placeholder() { return m_placeholder; }
     void createPlaceholder(PassRefPtr<RenderStyle>, const LayoutRect& frameRect);
@@ skipping 14 matching lines @@
 {
     ASSERT_WITH_SECURITY_IMPLICATION(object->isRenderFullScreen());
     return static_cast<RenderFullScreen*>(object);
 }
     
 // This will catch anyone doing an unnecessary cast:
 void toRenderFullScreen(RenderFullScreen*);
 }
 
 #endif