Apply FINAL to the RenderObject hierarchy.

Source/core/rendering/RenderMultiColumnBlock.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 15 matching lines @@
 
 #ifndef RenderMultiColumnBlock_h
 #define RenderMultiColumnBlock_h
 
 #include "RenderBlock.h"
 
 namespace WebCore {
 
 class RenderMultiColumnFlowThread;
 
-class RenderMultiColumnBlock : public RenderBlock {
+class RenderMultiColumnBlock FINAL : public RenderBlock {
 public:
     RenderMultiColumnBlock(Element*);
 
     LayoutUnit columnHeight() const { return m_columnHeight; }
     void setColumnHeight(LayoutUnit columnHeight) { m_columnHeight = columnHeight; }
 
     LayoutUnit columnWidth() const { return m_columnWidth; }
     unsigned columnCount() const { return m_columnCount; }
 
     RenderMultiColumnFlowThread* flowThread() const { return m_flowThread; }
@@ skipping 39 matching lines @@
     return static_cast<const RenderMultiColumnBlock*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderMultiColumnBlock(const RenderMultiColumnBlock*);
 
 } // namespace WebCore
 
 #endif // RenderMultiColumnBlock_h