Use DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION to generate toSVGSMILElement()

Source/core/svg/animation/SVGSMILElement.h

Index: Source/core/svg/animation/SVGSMILElement.h
diff --git a/Source/core/svg/animation/SVGSMILElement.h b/Source/core/svg/animation/SVGSMILElement.h
index 3ed75c5215c6be11380382b785cfe22ff5c77d2e..44c4fa19a4773af4b0fa2b409fd401bc85cbbe90 100644
--- a/Source/core/svg/animation/SVGSMILElement.h
+++ b/Source/core/svg/animation/SVGSMILElement.h
@@ -26,6 +26,7 @@
 #ifndef SVGSMILElement_h
 #define SVGSMILElement_h
 
+#include "SVGNames.h"
 #include "core/svg/SVGElement.h"
 #include "core/svg/animation/SMILTime.h"
 #include "wtf/HashMap.h"
@@ -45,8 +46,6 @@ public:
     SVGSMILElement(const QualifiedName&, Document&);
     virtual ~SVGSMILElement();
 
-    static bool isSMILElement(Node*);
-
     bool isSupportedAttribute(const QualifiedName&);
     virtual void parseAttribute(const QualifiedName&, const AtomicString&) OVERRIDE;
     virtual void svgAttributeChanged(const QualifiedName&) OVERRIDE;
@@ -239,12 +238,14 @@ private:
     friend class ConditionEventListener;
 };
 
-inline SVGSMILElement* toSVGSMILElement(Element* element)
+inline bool isSVGSMILElement(const Node& node)
 {
-    ASSERT_WITH_SECURITY_IMPLICATION(!element || SVGSMILElement::isSMILElement(element));
-    return static_cast<SVGSMILElement*>(element);
+    return node.hasTagName(SVGNames::setTag) || node.hasTagName(SVGNames::animateTag) || node.hasTagName(SVGNames::animateMotionTag)
+        || node.hasTagName(SVGNames::animateTransformTag) || node.hasTagName(SVGNames::animateColorTag);
 }
 
+DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION(SVGSMILElement);
+
 }
 
 #endif // SVGSMILElement_h