Introduce DEFINE_DOCUMENT_TYPE_CASTS, and use it

Source/core/html/HTMLDocument.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009 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 91 matching lines @@
 inline bool HTMLDocument::hasNamedItem(const AtomicString& name)
 {
     return m_namedItemCounts.contains(name);
 }
 
 inline bool HTMLDocument::hasExtraNamedItem(const AtomicString& name)
 {
     return m_extraNamedItemCounts.contains(name);
 }
 
-inline HTMLDocument* toHTMLDocument(Document* document)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!document || document->isHTMLDocument());
-    return static_cast<HTMLDocument*>(document);
-}
-
-inline const HTMLDocument* toHTMLDocument(const Document* document)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(!document || document->isHTMLDocument());
-    return static_cast<const HTMLDocument*>(document);
-}
-
-inline HTMLDocument& toHTMLDocument(Document& document)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(document.isHTMLDocument());
-    return static_cast<HTMLDocument&>(document);
-}
-
-inline const HTMLDocument& toHTMLDocument(const Document& document)
-{
-    ASSERT_WITH_SECURITY_IMPLICATION(document.isHTMLDocument());
-    return static_cast<const HTMLDocument&>(document);
-}
-
-// This will catch anyone doing an unnecessary cast.
-void toHTMLDocument(const HTMLDocument*);
+DEFINE_DOCUMENT_TYPE_CASTS(HTMLDocument);
 
 } // namespace WebCore
 
 #endif // HTMLDocument_h