Add template parameter to ElementTraversal to iterate over Elements of a specific type

Source/core/dom/NodeIterator.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
  * Copyright (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2008 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef NodeIterator_h
 #define NodeIterator_h
 
 #include "bindings/v8/ScriptWrappable.h"
 #include "core/dom/NodeFilter.h"
-#include "core/dom/Traversal.h"
+#include "core/dom/NodeIteratorBase.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class ExceptionState;
 
-class NodeIterator : public ScriptWrappable, public RefCounted<NodeIterator>, public Traversal {
+class NodeIterator : public ScriptWrappable, public RefCounted<NodeIterator>, public NodeIteratorBase {
 public:
     static PassRefPtr<NodeIterator> create(PassRefPtr<Node> rootNode, unsigned whatToShow, PassRefPtr<NodeFilter> filter)
     {
         return adoptRef(new NodeIterator(rootNode, whatToShow, filter));
     }
     ~NodeIterator();
 
     PassRefPtr<Node> nextNode(ScriptState*, ExceptionState&);
     PassRefPtr<Node> previousNode(ScriptState*, ExceptionState&);
     void detach();
@@ skipping 20 matching lines @@
     void updateForNodeRemoval(Node& nodeToBeRemoved, NodePointer&) const;
 
     NodePointer m_referenceNode;
     NodePointer m_candidateNode;
     bool m_detached;
 };
 
 } // namespace WebCore
 
 #endif // NodeIterator_h