Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/svg/RenderSVGText.h

 /*
  * Copyright (C) 2006 Apple Computer, Inc.
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) Research In Motion Limited 2010-2012. 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 83 matching lines @@
 
     bool m_needsReordering : 1;
     bool m_needsPositioningValuesUpdate : 1;
     bool m_needsTransformUpdate : 1;
     bool m_needsTextMetricsUpdate : 1;
     AffineTransform m_localTransform;
     SVGTextLayoutAttributesBuilder m_layoutAttributesBuilder;
     Vector<SVGTextLayoutAttributes*> m_layoutAttributes;
 };
 
-inline RenderSVGText* toRenderSVGText(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGText());
-    return static_cast<RenderSVGText*>(object);
-}
-
-inline const RenderSVGText* toRenderSVGText(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGText());
-    return static_cast<const RenderSVGText*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderSVGText(const RenderSVGText*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGText, isSVGText());
 
 }
 
 #endif