Use DEFINE_NODE_TYPE_CASTS instead of using manual toHTMLFooElement()

Source/core/html/HTMLParamElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2006, 2010 Apple Inc. 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 26 matching lines @@
     static bool isURLParameter(const String&);
 
 private:
     HTMLParamElement(const QualifiedName&, Document&);
 
     virtual bool isURLAttribute(const Attribute&) const OVERRIDE;
 
     virtual void addSubresourceAttributeURLs(ListHashSet<KURL>&) const;
 };
 
-inline HTMLParamElement* toHTMLParamElement(Node* node)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!node || node->hasTagName(HTMLNames::paramTag));
-    return static_cast<HTMLParamElement*>(node);
-}
+DEFINE_NODE_TYPE_CASTS(HTMLParamElement, hasTagName(HTMLNames::paramTag));
 
 } // namespace WebCore
 
 #endif