Use new is*Element() helper functions in DOM code

Source/core/dom/DocumentOrderedMap.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 37 matching lines @@
     bool contains(StringImpl*) const;
     bool containsMultiple(StringImpl*) const;
     // concrete instantiations of the get<>() method template
     Element* getElementById(StringImpl*, const TreeScope*) const;
     const Vector<Element*>& getAllElementsById(StringImpl*, const TreeScope*) const;
     Element* getElementByMapName(StringImpl*, const TreeScope*) const;
     Element* getElementByLowercasedMapName(StringImpl*, const TreeScope*) const;
     Element* getElementByLabelForAttribute(StringImpl*, const TreeScope*) const;
 
 private:
-    template<bool keyMatches(StringImpl*, Element*)> Element* get(StringImpl*, const TreeScope*) const;
+    template<bool keyMatches(StringImpl*, Element&)> Element* get(StringImpl*, const TreeScope*) const;
 
     struct MapEntry {
         explicit MapEntry(Element* firstElement)
             : element(firstElement)
             , count(1)
         { }
 
         Element* element;
         unsigned count;
         Vector<Element*> orderedList;
@@ skipping 11 matching lines @@
 
 inline bool DocumentOrderedMap::containsMultiple(StringImpl* id) const
 {
     Map::const_iterator it = m_map.find(id);
     return it != m_map.end() && it->value->count > 1;
 }
 
 } // namespace WebCore
 
 #endif // DocumentOrderedMap_h