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diff --git a/WebCore/bindings/js/WebCoreJSClientData.h b/WebCore/bindings/js/WebCoreJSClientData.h
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+++ b/WebCore/bindings/js/WebCoreJSClientData.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 WebCoreJSClientData_h
+#define WebCoreJSClientData_h
+
+#include "DOMWrapperWorld.h"
+#include "DOMObjectHashTableMap.h"
+#include <wtf/Noncopyable.h>
+#include <wtf/HashSet.h>
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class WebCoreJSClientData : public JSC::JSGlobalData::ClientData, public Noncopyable {
+    friend class JSGlobalDataWorldIterator;
+    friend void initNormalWorldClientData(JSC::JSGlobalData*);
+
+public:
+    virtual ~WebCoreJSClientData()
+    {
+        ASSERT(m_worldSet.contains(m_normalWorld.get()));
+        ASSERT(m_worldSet.size() == 1);
+        ASSERT(m_normalWorld->hasOneRef());
+        m_normalWorld.clear();
+        ASSERT(m_worldSet.isEmpty());
+    }
+
+    DOMWrapperWorld* normalWorld() { return m_normalWorld.get(); }
+
+    void getAllWorlds(Vector<DOMWrapperWorld*>& worlds)
+    {
+        copyToVector(m_worldSet, worlds);
+    }
+
+    void rememberWorld(DOMWrapperWorld* world)
+    {
+        ASSERT(!m_worldSet.contains(world));
+        m_worldSet.add(world);
+    }
+    void forgetWorld(DOMWrapperWorld* world)
+    {
+        ASSERT(m_worldSet.contains(world));
+        m_worldSet.remove(world);
+    }
+
+    DOMObjectHashTableMap hashTableMap;
+
+private:
+    HashSet<DOMWrapperWorld*> m_worldSet;
+    RefPtr<DOMWrapperWorld> m_normalWorld;
+};
+
+inline void initNormalWorldClientData(JSC::JSGlobalData* globalData)
+{
+    WebCoreJSClientData* webCoreJSClientData = new WebCoreJSClientData;
+    globalData->clientData = webCoreJSClientData; // ~JSGlobalData deletes this pointer.
+    webCoreJSClientData->m_normalWorld = DOMWrapperWorld::create(globalData, true);
+}
+
+} // namespace WebCore
+
+#endif // WebCoreJSClientData_h