Introduce and use type casting functions for several HTMLCollection types

Source/core/dom/TagCollection.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 38 matching lines @@
 
     bool elementMatches(const Element&) const;
 
 protected:
     TagCollection(ContainerNode& rootNode, CollectionType, const AtomicString& namespaceURI, const AtomicString& localName);
 
     AtomicString m_namespaceURI;
     AtomicString m_localName;
 };
 
+DEFINE_TYPE_CASTS(TagCollection, LiveNodeListBase, collection, collection->type() == TagCollectionType, collection.type() == TagCollectionType);
+
 class HTMLTagCollection FINAL : public TagCollection {
 public:
     static PassRefPtrWillBeRawPtr<HTMLTagCollection> create(ContainerNode& rootNode, CollectionType type, const AtomicString& localName)
     {
         ASSERT_UNUSED(type, type == HTMLTagCollectionType);
         return adoptRefWillBeNoop(new HTMLTagCollection(rootNode, localName));
     }
 
     bool elementMatches(const Element&) const;
 
 private:
     HTMLTagCollection(ContainerNode& rootNode, const AtomicString& localName);
 
     AtomicString m_loweredLocalName;
 };
 
+DEFINE_TYPE_CASTS(HTMLTagCollection, LiveNodeListBase, collection, collection->type() == HTMLTagCollectionType, collection.type() == HTMLTagCollectionType);
+
 inline bool HTMLTagCollection::elementMatches(const Element& testElement) const
 {
     // Implements http://dvcs.w3.org/hg/domcore/raw-file/tip/Overview.html#concept-getelementsbytagname
     if (m_localName != starAtom) {
         const AtomicString& localName = testElement.isHTMLElement() ? m_loweredLocalName : m_localName;
         if (localName != testElement.localName())
             return false;
     }
     ASSERT(m_namespaceURI == starAtom);
     return true;
 }
 
 } // namespace WebCore
 
 #endif // TagCollection_h