Generate toFooElement() functions from tagname data

Source/core/svg/SVGPolygonElement.h

Index: Source/core/svg/SVGPolygonElement.h
diff --git a/Source/core/svg/SVGPolygonElement.h b/Source/core/svg/SVGPolygonElement.h
index 0076f6495aa91bb43a837a47825b68c5d5505d29..af7050a003a3f6a8ae3f0b0a8bacccc4492d7943 100644
--- a/Source/core/svg/SVGPolygonElement.h
+++ b/Source/core/svg/SVGPolygonElement.h
@@ -21,7 +21,6 @@
 #ifndef SVGPolygonElement_h
 #define SVGPolygonElement_h
 
-#include "SVGNames.h"
 #include "core/svg/SVGPolyElement.h"
 
 namespace WebCore {
@@ -34,12 +33,6 @@ private:
     SVGPolygonElement(const QualifiedName&, Document&);
 };
 
-inline SVGPolygonElement* toSVGPolygonElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(SVGNames::polygonTag));
-    return static_cast<SVGPolygonElement*>(node);
-}
-
 } // namespace WebCore
 
 #endif