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diff --git a/Source/WebKit2/Shared/MutableDictionary.h b/Source/WebKit2/Shared/MutableDictionary.h
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+/*
+ * Copyright (C) 2010 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. 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 INC. 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 MutableDictionary_h
+#define MutableDictionary_h
+
+#include "ImmutableDictionary.h"
+
+namespace WebKit {
+
+// MutableDictionary - A mutable dictionary type suitable for vending to an API.
+
+class MutableDictionary : public ImmutableDictionary {
+public:
+    static PassRefPtr<MutableDictionary> create()
+    {
+        return adoptRef(new MutableDictionary);
+    }
+
+    ~MutableDictionary();
+
+    bool add(const String& key, APIObject*);
+    bool set(const String& key, APIObject*);
+
+    virtual bool isMutable() { return true; }
+
+private:
+    MutableDictionary();
+};
+
+} // namespace WebKit
+
+#endif // MutableDictionary_h