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diff --git a/Source/WebKit2/UIProcess/UserContent/WebScriptMessageHandler.h b/Source/WebKit2/UIProcess/UserContent/WebScriptMessageHandler.h
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+++ b/Source/WebKit2/UIProcess/UserContent/WebScriptMessageHandler.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.
+ */
+
+#ifndef WebScriptMessageHandler_h
+#define WebScriptMessageHandler_h
+
+#include "WebUserContentControllerDataTypes.h"
+#include <wtf/Ref.h>
+#include <wtf/RefCounted.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+struct SecurityOriginData;
+class SerializedScriptValue;
+}
+
+namespace API {
+class UserContentWorld;
+}
+
+namespace WebKit {
+
+class WebPageProxy;
+class WebFrameProxy;
+struct FrameInfoData;
+
+class WebScriptMessageHandler : public RefCounted<WebScriptMessageHandler> {
+public:
+    class Client {
+    public:
+        virtual ~Client() { }
+        virtual void didPostMessage(WebPageProxy&, const FrameInfoData&, WebCore::SerializedScriptValue&) = 0;
+    };
+
+    static Ref<WebScriptMessageHandler> create(std::unique_ptr<Client>, const String& name, API::UserContentWorld&);
+    virtual ~WebScriptMessageHandler();
+
+    uint64_t identifier() const { return m_identifier; }
+    String name() const { return m_name; }
+
+    const API::UserContentWorld& userContentWorld() const { return m_world; }
+    API::UserContentWorld& userContentWorld() { return m_world; }
+
+    Client& client() const { return *m_client; }
+
+private:
+    WebScriptMessageHandler(std::unique_ptr<Client>, const String&, API::UserContentWorld&);
+    
+    uint64_t m_identifier;
+
+    std::unique_ptr<Client> m_client;
+    String m_name;
+    Ref<API::UserContentWorld> m_world;
+};
+
+} // namespace API
+    
+#endif // WebScriptMessageHandler_h