Introduce isHTMLAnchorElement and toHTMLAnchorElement

Source/core/dom/TreeScope.cpp

 /*
  * Copyright (C) 2011 Google Inc. All Rights Reserved.
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 284 matching lines @@
     return m_selection.get();
 }
 
 Element* TreeScope::findAnchor(const String& name)
 {
     if (name.isEmpty())
         return 0;
     if (Element* element = getElementById(name))
         return element;
     for (Element* element = ElementTraversal::firstWithin(rootNode()); element; element = ElementTraversal::next(element)) {
-        if (element->hasTagName(aTag)) {
-            HTMLAnchorElement* anchor = static_cast<HTMLAnchorElement*>(element);
+        if (isHTMLAnchorElement(element)) {
+            HTMLAnchorElement* anchor = toHTMLAnchorElement(element);
             if (rootNode()->document()->inQuirksMode()) {
                 // Quirks mode, case insensitive comparison of names.
                 if (equalIgnoringCase(anchor->name(), name))
                     return anchor;
             } else {
                 // Strict mode, names need to match exactly.
                 if (anchor->name() == name)
                     return anchor;
             }
         }
@@ skipping 189 matching lines @@
             result = element;
         for (ShadowRoot* shadowRoot = element->youngestShadowRoot(); shadowRoot; shadowRoot = shadowRoot->olderShadowRoot()) {
             if (Element* shadowResult = shadowRoot->getElementByAccessKey(key))
                 result = shadowResult;
         }
     }
     return result;
 }
 
 } // namespace WebCore