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diff --git a/Source/WebCore/dom/TreeWalker.h b/Source/WebCore/dom/TreeWalker.h
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+/*
+ * 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 TreeWalker_h
+#define TreeWalker_h
+
+#include "NodeFilter.h"
+#include "Traversal.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+    typedef int ExceptionCode;
+
+    class TreeWalker : public RefCounted<TreeWalker>, public Traversal {
+    public:
+        static PassRefPtr<TreeWalker> create(PassRefPtr<Node> rootNode, unsigned whatToShow, PassRefPtr<NodeFilter> filter, bool expandEntityReferences)
+        {
+            return adoptRef(new TreeWalker(rootNode, whatToShow, filter, expandEntityReferences));
+        }                            
+
+        Node* currentNode() const { return m_current.get(); }
+        void setCurrentNode(PassRefPtr<Node>, ExceptionCode&);
+
+        Node* parentNode(ScriptState*);
+        Node* firstChild(ScriptState*);
+        Node* lastChild(ScriptState*);
+        Node* previousSibling(ScriptState*);
+        Node* nextSibling(ScriptState*);
+        Node* previousNode(ScriptState*);
+        Node* nextNode(ScriptState*);
+
+        // Do not call these functions. They are just scaffolding to support the Objective-C bindings.
+        // They operate in the main thread normal world, and they swallow JS exceptions.
+        Node* parentNode() { return parentNode(scriptStateFromNode(mainThreadNormalWorld(), m_current.get())); }
+        Node* firstChild() { return firstChild(scriptStateFromNode(mainThreadNormalWorld(), m_current.get())); }
+        Node* lastChild() { return lastChild(scriptStateFromNode(mainThreadNormalWorld(), m_current.get())); }
+        Node* previousSibling() { return previousSibling(scriptStateFromNode(mainThreadNormalWorld(), m_current.get())); }
+        Node* nextSibling() { return nextSibling(scriptStateFromNode(mainThreadNormalWorld(), m_current.get())); }
+        Node* previousNode() { return previousNode(scriptStateFromNode(mainThreadNormalWorld(), m_current.get())); }
+        Node* nextNode() { return nextNode(scriptStateFromNode(mainThreadNormalWorld(), m_current.get())); }
+
+    private:
+        TreeWalker(PassRefPtr<Node>, unsigned whatToShow, PassRefPtr<NodeFilter>, bool expandEntityReferences);
+        
+        Node* setCurrent(PassRefPtr<Node>);
+
+        RefPtr<Node> m_current;
+    };
+
+} // namespace WebCore
+
+#endif // TreeWalker_h