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diff --git a/JavaScriptCore/runtime/JSPropertyNameIterator.h b/JavaScriptCore/runtime/JSPropertyNameIterator.h
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+/*
+ * Copyright (C) 2008 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:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef JSPropertyNameIterator_h
+#define JSPropertyNameIterator_h
+
+#include "JSObject.h"
+#include "JSString.h"
+#include "PropertyNameArray.h"
+
+namespace JSC {
+
+    class Identifier;
+    class JSObject;
+
+    class JSPropertyNameIterator : public JSCell {
+    public:
+        static JSPropertyNameIterator* create(ExecState*, JSValue*);
+
+        virtual ~JSPropertyNameIterator();
+
+        virtual JSValue* toPrimitive(ExecState*, PreferredPrimitiveType) const;
+        virtual bool getPrimitiveNumber(ExecState*, double&, JSValue*&);
+        virtual bool toBoolean(ExecState*) const;
+        virtual double toNumber(ExecState*) const;
+        virtual UString toString(ExecState*) const;
+        virtual JSObject* toObject(ExecState*) const;
+
+        virtual void mark();
+
+        JSValue* next(ExecState*);
+        void invalidate();
+
+    private:
+        JSPropertyNameIterator();
+        JSPropertyNameIterator(JSObject*, PassRefPtr<PropertyNameArrayData> propertyNameArrayData);
+
+        JSObject* m_object;
+        RefPtr<PropertyNameArrayData> m_data;
+        PropertyNameArrayData::const_iterator m_position;
+        PropertyNameArrayData::const_iterator m_end;
+    };
+
+inline JSPropertyNameIterator::JSPropertyNameIterator()
+    : JSCell(0)
+    , m_object(0)
+    , m_position(0)
+    , m_end(0)
+{
+}
+
+inline JSPropertyNameIterator::JSPropertyNameIterator(JSObject* object, PassRefPtr<PropertyNameArrayData> propertyNameArrayData)
+    : JSCell(0)
+    , m_object(object)
+    , m_data(propertyNameArrayData)
+    , m_position(m_data->begin())
+    , m_end(m_data->end())
+{
+}
+
+inline JSPropertyNameIterator* JSPropertyNameIterator::create(ExecState* exec, JSValue* v)
+{
+    if (v->isUndefinedOrNull())
+        return new (exec) JSPropertyNameIterator;
+
+    JSObject* o = v->toObject(exec);
+    PropertyNameArray propertyNames(exec);
+    o->getPropertyNames(exec, propertyNames);
+    return new (exec) JSPropertyNameIterator(o, propertyNames.releaseData());
+}
+
+inline JSValue* JSPropertyNameIterator::next(ExecState* exec)
+{
+    if (m_position == m_end)
+        return noValue();
+
+    if (m_data->cachedStructureID() == m_object->structureID() && structureIDChainsAreEqual(m_data->cachedPrototypeChain(), m_object->structureID()->cachedPrototypeChain()))
+        return jsOwnedString(exec, (*m_position++).ustring());
+
+    do {
+        if (m_object->hasProperty(exec, *m_position))
+            return jsOwnedString(exec, (*m_position++).ustring());
+        m_position++;
+    } while (m_position != m_end);
+
+    return noValue();
+}
+
+} // namespace JSC
+
+#endif // JSPropertyNameIterator_h