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diff --git a/WebCore/bindings/js/DOMObjectHashTableMap.h b/WebCore/bindings/js/DOMObjectHashTableMap.h
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+++ b/WebCore/bindings/js/DOMObjectHashTableMap.h
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+/*
+ *  Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
+ *  Copyright (C) 2003, 2004, 2005, 2006, 2008, 2009 Apple Inc. All rights reserved.
+ *  Copyright (C) 2007 Samuel Weinig <sam@webkit.org>
+ *  Copyright (C) 2009 Google, Inc. All rights reserved.
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser 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
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef DOMObjectHashTableMap_h
+#define DOMObjectHashTableMap_h
+
+#include <runtime/Lookup.h>
+#include <wtf/HashMap.h>
+
+namespace JSC {
+    class JSGlobalData;
+}
+
+namespace WebCore {
+
+// Map from static HashTable instances to per-GlobalData ones.
+class DOMObjectHashTableMap {
+public:
+    static DOMObjectHashTableMap& mapFor(JSC::JSGlobalData&);
+
+    ~DOMObjectHashTableMap()
+    {
+        HashMap<const JSC::HashTable*, JSC::HashTable>::iterator mapEnd = m_map.end();
+        for (HashMap<const JSC::HashTable*, JSC::HashTable>::iterator iter = m_map.begin(); iter != m_map.end(); ++iter)
+            iter->second.deleteTable();
+    }
+
+    const JSC::HashTable* get(const JSC::HashTable* staticTable)
+    {
+        HashMap<const JSC::HashTable*, JSC::HashTable>::iterator iter = m_map.find(staticTable);
+        if (iter != m_map.end())
+            return &iter->second;
+        return &m_map.set(staticTable, JSC::HashTable(*staticTable)).first->second;
+    }
+
+private:
+    HashMap<const JSC::HashTable*, JSC::HashTable> m_map;
+};
+
+} // namespace WebCore
+
+#endif // DOMObjectHashTableMap_h