Use DEFINE_NODE_TYPE_CASTS instead of using manual toHTMLFooElement()

Source/core/html/HTMLScriptElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@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.
@@ skipping 56 matching lines @@
     virtual bool deferAttributeValue() const;
     virtual bool hasSourceAttribute() const;
 
     virtual void dispatchLoadEvent();
 
     virtual PassRefPtr<Element> cloneElementWithoutAttributesAndChildren();
 
     OwnPtr<ScriptLoader> m_loader;
 };
 
-inline HTMLScriptElement* toHTMLScriptElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(HTMLNames::scriptTag));
-    return static_cast<HTMLScriptElement*>(node);
-}
+DEFINE_NODE_TYPE_CASTS(HTMLScriptElement, hasTagName(HTMLNames::scriptTag));
 
 } //namespace
 
 #endif