Apply FINAL to the RenderObject hierarchy.

Source/core/rendering/RenderTextFragment.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 13 matching lines @@
 #define RenderTextFragment_h
 
 #include "RenderText.h"
 
 namespace WebCore {
 
 // Used to represent a text substring of an element, e.g., for text runs that are split because of
 // first letter and that must therefore have different styles (and positions in the render tree).
 // We cache offsets so that text transformations can be applied in such a way that we can recover
 // the original unaltered string from our corresponding DOM node.
-class RenderTextFragment : public RenderText {
+class RenderTextFragment FINAL : public RenderText {
 public:
     RenderTextFragment(Node*, StringImpl*, int startOffset, int length);
     RenderTextFragment(Node*, StringImpl*);
     virtual ~RenderTextFragment();
 
     virtual bool isTextFragment() const { return true; }
 
     virtual bool canBeSelectionLeaf() const OVERRIDE { return node() && node()->rendererIsEditable(); }
 
     unsigned start() const { return m_start; }
@@ skipping 35 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!object || toRenderText(object)->isTextFragment());
     return static_cast<const RenderTextFragment*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderTextFragment(const RenderTextFragment*);
 
 } // namespace WebCore
 
 #endif // RenderTextFragment_h