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diff --git a/webkit/port/bindings/v8/ScriptInstance.h b/webkit/port/bindings/v8/ScriptInstance.h
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+/*
+ * Copyright (c) 2008, Google 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:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER OR 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 ScriptInstance_h
+#define ScriptInstance_h
+
+#include "v8.h"
+#include <wtf/Forward.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+
+namespace WebCore {
+
+class V8ScriptInstance : public RefCounted<V8ScriptInstance> {
+public:
+    static PassRefPtr<V8ScriptInstance> create(v8::Handle<v8::Object> instance)
+    {
+        return adoptRef(new V8ScriptInstance(instance));
+    }
+    V8ScriptInstance();
+    V8ScriptInstance(v8::Handle<v8::Object>);
+    ~V8ScriptInstance();
+    v8::Persistent<v8::Object> instance();
+
+private:
+    void clear();
+    void set(v8::Handle<v8::Object>);
+    mutable v8::Persistent<v8::Object> m_instance;
+};
+
+typedef RefPtr<V8ScriptInstance> ScriptInstance;
+typedef PassRefPtr<V8ScriptInstance> PassScriptInstance;
+
+} // namespace WebCore
+
+#endif // ScriptInstance_h