Generate toSVGAnimateElement to support more plenty helper functions

Source/core/svg/SVGAnimateElement.h

 /*
  * Copyright (C) 2004, 2005 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005 Rob Buis <buis@kde.org>
  * Copyright (C) 2008 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. 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 57 matching lines @@
 
     OwnPtr<SVGAnimatedType> m_fromType;
     OwnPtr<SVGAnimatedType> m_toType;
     OwnPtr<SVGAnimatedType> m_toAtEndOfDurationType;
     OwnPtr<SVGAnimatedType> m_animatedType;
 
     SVGElementAnimatedPropertyList m_animatedProperties;
     OwnPtr<SVGAnimatedTypeAnimator> m_animator;
 };
 
-inline SVGAnimateElement* toSVGAnimateElement(Element* element)
+inline bool isSVGAnimateElement(const Node& node)
 {
-    ASSERT_WITH_SECURITY_IMPLICATION(!element
-        || element->hasTagName(SVGNames::animateTag)
-        || element->hasTagName(SVGNames::animateColorTag)
-        || element->hasTagName(SVGNames::animateTransformTag)
-        || element->hasTagName(SVGNames::setTag));
-    return static_cast<SVGAnimateElement*>(element);
+    return node.hasTagName(SVGNames::animateTag)
+        || node.hasTagName(SVGNames::animateColorTag)
+        || node.hasTagName(SVGNames::animateTransformTag)
+        || node.hasTagName(SVGNames::setTag);
 }
 
+DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION(SVGAnimateElement);
+
 } // namespace WebCore
 
 #endif // SVGAnimateElement_h