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diff --git a/Source/WebKit2/WebProcess/InjectedBundle/InjectedBundleDOMWindowExtension.h b/Source/WebKit2/WebProcess/InjectedBundle/InjectedBundleDOMWindowExtension.h
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+++ b/Source/WebKit2/WebProcess/InjectedBundle/InjectedBundleDOMWindowExtension.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2012 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. 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 InjectedBundleDOMWindowExtension_h
+#define InjectedBundleDOMWindowExtension_h
+
+#include "APIObject.h"
+#include <wtf/RefPtr.h>
+
+namespace WebCore {
+
+class DOMWindowExtension;
+
+}
+
+namespace WebKit {
+
+class InjectedBundleScriptWorld;
+class WebFrame;
+
+class InjectedBundleDOMWindowExtension : public APIObject {
+public:
+    static const Type APIType = TypeBundleDOMWindowExtension;
+
+    static PassRefPtr<InjectedBundleDOMWindowExtension> create(WebFrame*, InjectedBundleScriptWorld*);
+    static InjectedBundleDOMWindowExtension* get(WebCore::DOMWindowExtension*);
+
+    virtual ~InjectedBundleDOMWindowExtension();
+    
+    WebFrame* frame() const;
+    InjectedBundleScriptWorld* world() const;
+
+private:
+    virtual Type type() const { return APIType; }
+
+    InjectedBundleDOMWindowExtension(WebFrame*, InjectedBundleScriptWorld*);
+
+    RefPtr<WebCore::DOMWindowExtension> m_coreExtension;
+    mutable RefPtr<InjectedBundleScriptWorld> m_world;
+};
+
+} // namespace WebKit
+
+#endif // InjectedBundleDOMWindowExtension_h