Apply FINAL to the RenderObject hierarchy.

Source/core/rendering/RenderCombineText.h

 /*
  * Copyright (C) 2011 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef RenderCombineText_h
 #define RenderCombineText_h
 
 #include "Font.h"
 #include "RenderText.h"
 
 namespace WebCore {
 
-class RenderCombineText : public RenderText {
+class RenderCombineText FINAL : public RenderText {
 public:
     RenderCombineText(Node*, PassRefPtr<StringImpl>);
 
     void combineText();
     void adjustTextOrigin(FloatPoint& textOrigin, const FloatRect& boxRect) const;
     void getStringToRender(int, String& string, int& length) const;
     bool isCombined() const { return m_isCombined; }
     float combinedTextWidth(const Font& font) const { return font.size(); }
     const Font& originalFont() const { return parent()->style()->font(); }
 
@@ skipping 20 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isCombineText());
     return static_cast<const RenderCombineText*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderCombineText(const RenderCombineText*);
 
 } // namespace WebCore
 
 #endif // RenderCombineText_h