Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/RenderTableCaption.h

 /*
  * Copyright (C) 2011 Robert Hogan <robert@roberthogan.net>
  *
  * 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
@@ skipping 25 matching lines @@
     virtual bool isTableCaption() const OVERRIDE { return true; }
 
     virtual bool supportsPartialLayout() const OVERRIDE { return false; }
 
     virtual void insertedIntoTree() OVERRIDE;
     virtual void willBeRemovedFromTree() OVERRIDE;
 
     RenderTable* table() const;
 };
 
-inline RenderTableCaption* toRenderTableCaption(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTableCaption());
-    return static_cast<RenderTableCaption*>(object);
-}
-
-inline const RenderTableCaption* toRenderTableCaption(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isTableCaption());
-    return static_cast<const RenderTableCaption*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderTableCaption(const RenderTableCaption*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderTableCaption, isTableCaption());
 
 } // namespace WebCore
 
 #endif // RenderTableCaption_h