Apply FINAL to the RenderObject hierarchy.

Source/core/rendering/RenderSearchField.h

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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 RenderSearchField_h
 
 #include "PopupMenuClient.h"
 #include "RenderTextControlSingleLine.h"
 
 namespace WebCore {
 
 class HTMLInputElement;
 class SearchPopupMenu;
 
-class RenderSearchField : public RenderTextControlSingleLine, private PopupMenuClient {
+class RenderSearchField FINAL : public RenderTextControlSingleLine, private PopupMenuClient {
 public:
     RenderSearchField(Element*);
     virtual ~RenderSearchField();
 
     void updateCancelButtonVisibility() const;
 
     void addSearchResult();
     void stopSearchEventTimer();
 
     bool popupIsVisible() const { return m_searchPopupIsVisible; }
@@ skipping 49 matching lines @@
     ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTextField());
     return static_cast<RenderSearchField*>(object);
 }
 
 // This will catch anyone doing an unnecessary cast.
 void toRenderSearchField(const RenderSearchField*);
 
 }
 
 #endif