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diff --git a/Source/WebKit2/WebProcess/Plugins/Netscape/NetscapePluginStream.h b/Source/WebKit2/WebProcess/Plugins/Netscape/NetscapePluginStream.h
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+++ b/Source/WebKit2/WebProcess/Plugins/Netscape/NetscapePluginStream.h
@@ -0,0 +1,112 @@
+/*
+ * 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 NetscapePluginStream_h
+#define NetscapePluginStream_h
+
+#include "RunLoop.h"
+#include <WebCore/FileSystem.h>
+#include <WebCore/npruntime_internal.h>
+#include <wtf/Forward.h>
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/RefPtr.h>
+#include <wtf/text/CString.h>
+
+namespace WebCore {
+    class KURL;
+}
+
+namespace WebKit {
+
+class NetscapePlugin;
+
+class NetscapePluginStream : public RefCounted<NetscapePluginStream> {
+public:
+    static PassRefPtr<NetscapePluginStream> create(PassRefPtr<NetscapePlugin> plugin, uint64_t streamID, bool sendNotification, void* notificationData)
+    {
+        return adoptRef(new NetscapePluginStream(plugin, streamID, sendNotification, notificationData));
+    }
+    ~NetscapePluginStream();
+
+    uint64_t streamID() const { return m_streamID; }
+    const NPStream* npStream() const { return &m_npStream; }
+
+    void didReceiveResponse(const WebCore::KURL& responseURL, uint32_t streamLength,
+                            uint32_t lastModifiedTime, const String& mimeType, const String& headers);
+    void didReceiveData(const char* bytes, int length);
+    void didFinishLoading();
+    void didFail(bool wasCancelled);
+
+    void sendJavaScriptStream(const String& requestURLString, const String& result);
+
+    void stop(NPReason);
+    NPError destroy(NPReason);
+
+private:
+    NetscapePluginStream(PassRefPtr<NetscapePlugin>, uint64_t streamID, bool sendNotification, void* notificationData);
+
+    bool start(const String& responseURLString, uint32_t streamLength, 
+               uint32_t lastModifiedTime, const String& mimeType, const String& headers);
+
+    void cancel();
+    void notifyAndDestroyStream(NPReason);
+
+    void deliverData(const char* bytes, int length);
+    void deliverDataToPlugin();
+    void deliverDataToFile(const char* bytes, int length);
+
+    RefPtr<NetscapePlugin> m_plugin;
+    uint64_t m_streamID;
+    
+    bool m_sendNotification;
+    void* m_notificationData;
+
+    NPStream m_npStream;
+    uint16_t m_transferMode;
+    int32_t m_offset;
+
+    CString m_filePath;
+    WebCore::PlatformFileHandle m_fileHandle;
+    
+    // Whether NPP_NewStream has successfully been called.
+    bool m_isStarted;
+
+#if !ASSERT_DISABLED
+    bool m_urlNotifyHasBeenCalled;
+#endif
+
+    CString m_responseURL;
+    CString m_mimeType;
+    CString m_headers;
+
+    RunLoop::Timer<NetscapePluginStream> m_deliveryDataTimer;
+    OwnPtr< Vector<uint8_t> > m_deliveryData;
+    bool m_stopStreamWhenDoneDelivering;
+};
+
+} // namespace WebKit
+
+#endif // NetscapePluginStream_h