Introduce DEFINE_RENDER_OBJECT_TYPE_CASTS to replace manual toRenderFoo, and use it

Source/core/rendering/svg/RenderSVGImage.h

 /*
  * Copyright (C) 2006 Alexander Kellett <lypanov@kde.org>
  * Copyright (C) 2006, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
  *
  * 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
@@ skipping 63 matching lines @@
     bool m_needsBoundariesUpdate : 1;
     bool m_needsTransformUpdate : 1;
     AffineTransform m_localTransform;
     FloatRect m_objectBoundingBox;
     FloatRect m_repaintBoundingBox;
     OwnPtr<RenderImageResource> m_imageResource;
 
     OwnPtr<ImageBuffer> m_bufferedForeground;
 };
 
-inline RenderSVGImage* toRenderSVGImage(RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGImage());
-    return static_cast<RenderSVGImage*>(object);
-}
-
-inline const RenderSVGImage* toRenderSVGImage(const RenderObject* object)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGImage());
-    return static_cast<const RenderSVGImage*>(object);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toRenderSVGImage(const RenderSVGImage*);
+DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGImage, isSVGImage());
 
 } // namespace WebCore
 
 #endif // RenderSVGImage_h