Use a bitmask for SVG render object types

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 30 matching lines @@
     virtual bool needsBoundariesUpdate() OVERRIDE { return m_needsBoundariesUpdate; }
     virtual void setNeedsTransformUpdate() { m_needsTransformUpdate = true; }
 
     RenderImageResource* imageResource() { return m_imageResource.get(); }
 
     // Note: Assumes the PaintInfo context has had all local transforms applied.
     void paintForeground(PaintInfo&);
 
 private:
     virtual const char* renderName() const { return "RenderSVGImage"; }
-    virtual bool isSVGImage() const OVERRIDE { return true; }
+    virtual SVGType getSVGType() const OVERRIDE { return IsSVGImage; }
 
     virtual const AffineTransform& localToParentTransform() const { return m_localTransform; }
 
     virtual FloatRect objectBoundingBox() const { return m_objectBoundingBox; }
     virtual FloatRect strokeBoundingBox() const { return m_objectBoundingBox; }
     virtual FloatRect repaintRectInLocalCoordinates() const { return m_repaintBoundingBox; }
 
     virtual void addFocusRingRects(Vector<IntRect>&, const LayoutPoint& additionalOffset, const RenderLayerModelObject* paintContainer = 0) OVERRIDE;
 
     virtual void imageChanged(WrappedImagePtr, const IntRect* = 0);
@@ skipping 15 matching lines @@
     OwnPtr<RenderImageResource> m_imageResource;
 
     OwnPtr<ImageBuffer> m_bufferedForeground;
 };
 
 DEFINE_RENDER_OBJECT_TYPE_CASTS(RenderSVGImage, isSVGImage());
 
 } // namespace WebCore
 
 #endif // RenderSVGImage_h