Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderQuote.h

 /*
  * Copyright (C) 2011 Nokia Inc. All rights reserved.
  * Copyright (C) 2012 Google 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,
@@ skipping 42 matching lines @@
     bool isAttached() { return m_attached; }
 
     QuoteType m_type;
     int m_depth;
     RenderQuote* m_next;
     RenderQuote* m_previous;
     bool m_attached;
     String m_text;
 };
 
-inline RenderQuote* toRenderQuote(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isQuote());
-    return static_cast<RenderQuote*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderQuote(const RenderQuote*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderQuote, isQuote());
 
 } // namespace WebCore
 
 #endif // RenderQuote_h