Optimize hasTagName when called on an HTMLElement / SVGElement

Source/core/html/HTMLUnknownElement.h

 /*
  * Copyright (c) 2011 Code Aurora Forum. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *     * Redistributions of source code must retain the above copyright
  *       notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  *       copyright notice, this list of conditions and the following
@@ skipping 33 matching lines @@
     virtual bool isHTMLUnknownElement() const OVERRIDE { return true; }
 
 private:
     HTMLUnknownElement(const QualifiedName& tagName, Document& document)
         : HTMLElement(tagName, document)
     {
         ScriptWrappable::init(this);
     }
 };
 
-inline bool isHTMLUnknownElement(const Element& element)
-{
-    return element.isHTMLElement() && toHTMLElement(element).isHTMLUnknownElement();
-}
-
 inline bool isHTMLUnknownElement(const HTMLElement& element)
 {
     return element.isHTMLUnknownElement();
 }
 
 DEFINE_HTMLELEMENT_TYPE_CASTS_WITH_FUNCTION(HTMLUnknownElement);
 
 } // namespace
 
 #endif