Remove toSVGStopElement(SVGElement*) because it can be covered by toSVGStopElement(Node*)

Source/core/svg/SVGStopElement.h

 /*
  * Copyright (C) 2004, 2005, 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2006 Rob Buis <buis@kde.org>
  *
  * 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,
@@ skipping 34 matching lines @@
     virtual RenderObject* createRenderer(RenderStyle*);
     virtual bool rendererIsNeeded(const NodeRenderingContext&) OVERRIDE;
 
     BEGIN_DECLARE_ANIMATED_PROPERTIES(SVGStopElement)
         DECLARE_ANIMATED_NUMBER(Offset, offset)
     END_DECLARE_ANIMATED_PROPERTIES
 };
 
 inline SVGStopElement* toSVGStopElement(Node* node)
 {
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(SVGNames::stopTag));
+    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(SVGNames::stopTag) || toSVGElement(node)->isGradientStop());

[tkent, 2013/08/20 08:41:52]

Either of hasTagName() or isGradientStop() should be enough.

     return static_cast<SVGStopElement*>(node);
 }
 
-inline SVGStopElement* toSVGStopElement(SVGElement* element)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!element || element->isGradientStop());
-    return static_cast<SVGStopElement*>(element);
-}
-
 } // namespace WebCore
 
 #endif