Apply FINAL to the RenderObject hierarchy.

Source/core/rendering/RenderRegionSet.h

 /*
  * Copyright (C) 2012 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 35 matching lines @@
 // FIXME: For now we derive from RenderRegion, but this may change at some point.
 
 class RenderRegionSet : public RenderRegion {
 public:
     RenderRegionSet(Element*, RenderFlowThread*);
     
 protected:
     virtual bool shouldHaveAutoLogicalHeight() const OVERRIDE { return false; }
 
 private:
-    virtual void installFlowThread() OVERRIDE;
+    virtual void installFlowThread() OVERRIDE FINAL;
 
-    virtual void expandToEncompassFlowThreadContentsIfNeeded() OVERRIDE;
+    virtual void expandToEncompassFlowThreadContentsIfNeeded() OVERRIDE FINAL;
 
     virtual const char* renderName() const = 0;
     
-    virtual bool isRenderRegionSet() const OVERRIDE { return true; }
+    virtual bool isRenderRegionSet() const OVERRIDE FINAL { return true; }
 };
 
 } // namespace WebCore
 
 #endif // RenderRegionSet_h