Refine toRenderSVGResourceContainer()

Source/core/rendering/svg/RenderSVGResourceContainer.h

 /*
  * Copyright (C) Research In Motion Limited 2010. 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 19 matching lines @@
 class RenderSVGResourceContainer : public RenderSVGHiddenContainer,
                                    public RenderSVGResource {
 public:
     explicit RenderSVGResourceContainer(SVGElement*);
     virtual ~RenderSVGResourceContainer();
 
     virtual void layout();
     virtual void styleDidChange(StyleDifference, const RenderStyle* oldStyle) OVERRIDE FINAL;
 
     virtual bool isSVGResourceContainer() const OVERRIDE FINAL { return true; }
-    virtual RenderSVGResourceContainer* toRenderSVGResourceContainer() OVERRIDE FINAL { return this; }
 
     static bool shouldTransformOnTextPainting(RenderObject*, AffineTransform&);
     static AffineTransform transformOnNonScalingStroke(RenderObject*, const AffineTransform& resourceTransform);
 
     void idChanged();
     void addClientRenderLayer(Node*);
     void addClientRenderLayer(RenderLayer*);
     void removeClientRenderLayer(RenderLayer*);
 
 protected:
@@ skipping 39 matching lines @@
 
 template<typename Renderer>
 Renderer* getRenderSVGResourceById(Document& document, const AtomicString& id)
 {
     if (RenderSVGResourceContainer* container = getRenderSVGResourceContainerById(document, id))
         return container->cast<Renderer>();
 
     return 0;
 }
 
+inline RenderSVGResourceContainer* toRenderSVGResourceContainer(RenderObject* object)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGResourceContainer());
+    return static_cast<RenderSVGResourceContainer*>(object);
+}
+
+inline const RenderSVGResourceContainer* toRenderSVGResourceContainer(const RenderObject* object)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!object || object->isSVGResourceContainer());
+    return static_cast<const RenderSVGResourceContainer*>(object);
+}
+
+// This will catch anyone doing an unnecessary cast.
+void toRenderSVGResourceContainer(const RenderSVGResourceContainer*);
+
 }
 
 #endif