Introduce isHTMLAnchorElement and toHTMLAnchorElement

Source/core/html/HTMLAnchorElement.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2007, 2008, 2009, 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 140 matching lines @@
     if (!m_cachedVisitedLinkHash)
         m_cachedVisitedLinkHash = WebCore::visitedLinkHash(document()->baseURL(), fastGetAttribute(HTMLNames::hrefAttr));
     return m_cachedVisitedLinkHash; 
 }
 
 // Functions shared with the other anchor elements (i.e., SVG).
 
 bool isEnterKeyKeydownEvent(Event*);
 bool isLinkClick(Event*);
 
+inline bool isHTMLAnchorElement(const Node* node)
+{
+    return node->hasTagName(HTMLNames::aTag);
+}
+
+inline bool isHTMLAnchorElement(const Element* element)
+{
+    return element->hasTagName(HTMLNames::aTag);
+}
+
+inline HTMLAnchorElement* toHTMLAnchorElement(Node* node)
+{
+    ASSERT_WITH_SECURITY_IMPLICATION(!node || isHTMLAnchorElement(node));
+    return static_cast<HTMLAnchorElement*>(node);
+}
+
 } // namespace WebCore
 
 #endif // HTMLAnchorElement_h