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diff --git a/Source/WebCore/page/UserMessageHandlersNamespace.h b/Source/WebCore/page/UserMessageHandlersNamespace.h
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+++ b/Source/WebCore/page/UserMessageHandlersNamespace.h
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+/*
+ * Copyright (C) 2014 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.
+ */
+
+#pragma once
+
+#if ENABLE(USER_MESSAGE_HANDLERS)
+
+#include "FrameDestructionObserver.h"
+#include "UserContentProvider.h"
+#include "UserMessageHandler.h"
+#include <wtf/HashMap.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+#include <wtf/text/AtomicString.h>
+#include <wtf/text/AtomicStringHash.h>
+
+namespace WebCore {
+
+class Frame;
+class UserMessageHandler;
+class DOMWrapperWorld;
+
+class UserMessageHandlersNamespace : public RefCounted<UserMessageHandlersNamespace>, public FrameDestructionObserver, public UserContentProviderInvalidationClient {
+public:
+    static Ref<UserMessageHandlersNamespace> create(Frame& frame, UserContentProvider& userContentProvider)
+    {
+        return adoptRef(*new UserMessageHandlersNamespace(frame, userContentProvider));
+    }
+
+    virtual ~UserMessageHandlersNamespace();
+
+    UserMessageHandler* handler(const AtomicString&, DOMWrapperWorld&);
+
+private:
+    explicit UserMessageHandlersNamespace(Frame&, UserContentProvider&);
+
+    // UserContentProviderInvalidationClient
+    void didInvalidate(UserContentProvider&) override;
+
+    Ref<UserContentProvider> m_userContentProvider;
+    HashMap<std::pair<AtomicString, RefPtr<DOMWrapperWorld>>, RefPtr<UserMessageHandler>> m_messageHandlers;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(USER_MESSAGE_HANDLERS)