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diff --git a/WebCore/bindings/v8/IsolatedWorld.h b/WebCore/bindings/v8/IsolatedWorld.h
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+/*
+ * Copyright (C) 2009 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 IsolatedWorld_h
+#define IsolatedWorld_h
+
+#include "DOMWrapperWorld.h"
+#include "V8DOMMap.h"
+
+namespace WebCore {
+
+// An DOMWrapperWorld other than the thread's normal world.
+class IsolatedWorld : public DOMWrapperWorld {
+public:
+    static PassRefPtr<IsolatedWorld> create() { return adoptRef(new IsolatedWorld()); }
+    static int count() { return isolatedWorldCount; }
+
+    DOMDataStore* domDataStore() const { return m_domDataStore.getStore(); }
+
+protected:
+    IsolatedWorld();
+    ~IsolatedWorld();
+
+private:
+    // The backing store for the isolated world's DOM wrappers.  This class
+    // doesn't have visibility into the wrappers.  This handle simply helps
+    // manage their lifetime.
+    DOMDataStoreHandle m_domDataStore;
+
+    static int isolatedWorldCount;
+};
+
+} // namespace WebCore
+
+#endif // IsolatedWorld_h