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diff --git a/Source/JavaScriptCore/runtime/JSWrapperObject.h b/Source/JavaScriptCore/runtime/JSWrapperObject.h
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+++ b/Source/JavaScriptCore/runtime/JSWrapperObject.h
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+/*
+ *  Copyright (C) 2006 Maks Orlovich
+ *  Copyright (C) 2006, 2007, 2008, 2009 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 JSWrapperObject_h
+#define JSWrapperObject_h
+
+#include "JSObject.h"
+
+namespace JSC {
+
+    // This class is used as a base for classes such as String,
+    // Number, Boolean and Date which are wrappers for primitive types.
+    class JSWrapperObject : public JSNonFinalObject {
+    public:
+        typedef JSNonFinalObject Base;
+
+        JSValue internalValue() const;
+        void setInternalValue(JSGlobalData&, JSValue);
+
+        static Structure* createStructure(JSGlobalData& globalData, JSGlobalObject* globalObject, JSValue prototype) 
+        { 
+            return Structure::create(globalData, globalObject, prototype, TypeInfo(ObjectType, StructureFlags), &s_info);
+        }
+
+    protected:
+        explicit JSWrapperObject(JSGlobalData&, Structure*);
+        static const unsigned StructureFlags = OverridesVisitChildren | JSNonFinalObject::StructureFlags;
+
+        static void visitChildren(JSCell*, SlotVisitor&);
+
+    private:
+        WriteBarrier<Unknown> m_internalValue;
+    };
+
+    inline JSWrapperObject::JSWrapperObject(JSGlobalData& globalData, Structure* structure)
+        : JSNonFinalObject(globalData, structure)
+    {
+    }
+
+    inline JSValue JSWrapperObject::internalValue() const
+    {
+        return m_internalValue.get();
+    }
+
+    inline void JSWrapperObject::setInternalValue(JSGlobalData& globalData, JSValue value)
+    {
+        ASSERT(value);
+        ASSERT(!value.isObject());
+        m_internalValue.set(globalData, this, value);
+    }
+
+} // namespace JSC
+
+#endif // JSWrapperObject_h