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diff --git a/Source/WebKit2/UIProcess/UserContent/WebUserContentControllerProxy.h b/Source/WebKit2/UIProcess/UserContent/WebUserContentControllerProxy.h
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+++ b/Source/WebKit2/UIProcess/UserContent/WebUserContentControllerProxy.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 WebUserContentControllerProxy_h
+#define WebUserContentControllerProxy_h
+
+#include "APIObject.h"
+#include "MessageReceiver.h"
+#include <wtf/Forward.h>
+#include <wtf/HashCountedSet.h>
+#include <wtf/HashMap.h>
+#include <wtf/HashSet.h>
+#include <wtf/Ref.h>
+#include <wtf/RefCounted.h>
+#include <wtf/text/StringHash.h>
+
+namespace API {
+class Array;
+class UserContentWorld;
+class UserContentExtension;
+class UserScript;
+class UserStyleSheet;
+}
+
+namespace IPC {
+class DataReference;
+}
+
+namespace WebCore {
+struct SecurityOriginData;
+}
+
+namespace WebKit {
+
+class WebProcessProxy;
+class WebScriptMessageHandler;
+struct FrameInfoData;
+
+class WebUserContentControllerProxy : public API::ObjectImpl<API::Object::Type::UserContentController>, private IPC::MessageReceiver {
+public:
+    static Ref<WebUserContentControllerProxy> create()
+    { 
+        return adoptRef(*new WebUserContentControllerProxy);
+    } 
+    explicit WebUserContentControllerProxy();
+    ~WebUserContentControllerProxy();
+
+    uint64_t identifier() const { return m_identifier; }
+
+    void addProcess(WebProcessProxy&);
+    void removeProcess(WebProcessProxy&);
+
+    API::Array& userScripts() { return m_userScripts.get(); }
+    void addUserScript(API::UserScript&);
+    void removeUserScript(API::UserScript&);
+    void removeAllUserScripts(API::UserContentWorld&);
+    void removeAllUserScripts();
+
+    API::Array& userStyleSheets() { return m_userStyleSheets.get(); }
+    void addUserStyleSheet(API::UserStyleSheet&);
+    void removeUserStyleSheet(API::UserStyleSheet&);
+    void removeAllUserStyleSheets(API::UserContentWorld&);
+    void removeAllUserStyleSheets();
+
+    void removeAllUserContent(API::UserContentWorld&);
+
+    // Returns false if there was a name conflict.
+    bool addUserScriptMessageHandler(WebScriptMessageHandler&);
+    void removeUserMessageHandlerForName(const String&, API::UserContentWorld&);
+    void removeAllUserMessageHandlers(API::UserContentWorld&);
+
+#if ENABLE(CONTENT_EXTENSIONS)
+    void addUserContentExtension(API::UserContentExtension&);
+    void removeUserContentExtension(const String&);
+    void removeAllUserContentExtensions();
+#endif
+
+private:
+    // IPC::MessageReceiver.
+    void didReceiveMessage(IPC::Connection&, IPC::Decoder&) override;
+
+    void didPostMessage(IPC::Connection&, uint64_t pageID, const FrameInfoData&, uint64_t messageHandlerID, const IPC::DataReference&);
+
+    void addUserContentWorldUse(API::UserContentWorld&);
+    void removeUserContentWorldUses(API::UserContentWorld&, unsigned numberOfUsesToRemove);
+    void removeUserContentWorldUses(HashCountedSet<RefPtr<API::UserContentWorld>>&);
+    bool shouldSendRemoveUserContentWorldsMessage(API::UserContentWorld&, unsigned numberOfUsesToRemove);
+
+    uint64_t m_identifier;
+    HashSet<WebProcessProxy*> m_processes;    
+    Ref<API::Array> m_userScripts;
+    Ref<API::Array> m_userStyleSheets;
+    HashMap<uint64_t, RefPtr<WebScriptMessageHandler>> m_scriptMessageHandlers;
+    HashCountedSet<RefPtr<API::UserContentWorld>> m_userContentWorlds;
+
+#if ENABLE(CONTENT_EXTENSIONS)
+    HashMap<String, RefPtr<API::UserContentExtension>> m_userContentExtensions;
+#endif
+};
+
+} // namespace WebKit
+
+#endif // WebUserContentControllerProxy_h