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diff --git a/Source/WebKit2/NetworkProcess/Downloads/Download.h b/Source/WebKit2/NetworkProcess/Downloads/Download.h
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+/*
+ * Copyright (C) 2010-2016 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 Download_h
+#define Download_h
+
+#include "DownloadID.h"
+#include "MessageSender.h"
+#include "SandboxExtension.h"
+#include <WebCore/ResourceHandle.h>
+#include <WebCore/ResourceHandleClient.h>
+#include <WebCore/ResourceRequest.h>
+#include <WebCore/SessionID.h>
+#include <memory>
+#include <wtf/Noncopyable.h>
+#include <wtf/RetainPtr.h>
+
+#if USE(NETWORK_SESSION)
+#if PLATFORM(COCOA)
+OBJC_CLASS NSURLSessionDownloadTask;
+#endif
+#else // USE(NETWORK_SESSION)
+#if PLATFORM(COCOA)
+OBJC_CLASS NSURLDownload;
+OBJC_CLASS WKDownloadAsDelegate;
+#endif
+#endif // USE(NETWORK_SESSION)
+
+#if USE(CFURLCONNECTION)
+#include <CFNetwork/CFURLDownloadPriv.h>
+#endif
+
+namespace IPC {
+class DataReference;
+}
+
+namespace WebCore {
+class AuthenticationChallenge;
+class BlobDataFileReference;
+class Credential;
+class ResourceError;
+class ResourceHandle;
+class ResourceResponse;
+}
+
+namespace WebKit {
+
+class DownloadManager;
+class NetworkDataTask;
+class NetworkSession;
+class WebPage;
+
+class Download : public IPC::MessageSender {
+    WTF_MAKE_NONCOPYABLE(Download); WTF_MAKE_FAST_ALLOCATED;
+public:
+#if USE(NETWORK_SESSION)
+    Download(DownloadManager&, DownloadID, NetworkDataTask&, const WebCore::SessionID& sessionID, const String& suggestedFilename = { });
+#if PLATFORM(COCOA)
+    Download(DownloadManager&, DownloadID, NSURLSessionDownloadTask*, const WebCore::SessionID& sessionID, const String& suggestedFilename = { });
+#endif
+#else
+    Download(DownloadManager&, DownloadID, const WebCore::ResourceRequest&, const String& suggestedFilename = { });
+#endif
+
+    ~Download();
+
+#if !USE(NETWORK_SESSION)
+    void setBlobFileReferences(Vector<RefPtr<WebCore::BlobDataFileReference>>&& fileReferences) { m_blobFileReferences = WTFMove(fileReferences); }
+
+    void start();
+    void startWithHandle(WebCore::ResourceHandle*, const WebCore::ResourceResponse&);
+#endif
+    void resume(const IPC::DataReference& resumeData, const String& path, const SandboxExtension::Handle&);
+    void cancel();
+
+    DownloadID downloadID() const { return m_downloadID; }
+    const String& suggestedName() const { return m_suggestedName; }
+
+#if USE(NETWORK_SESSION)
+    void setSandboxExtension(RefPtr<SandboxExtension>&& sandboxExtension) { m_sandboxExtension = WTFMove(sandboxExtension); }
+#else
+    const WebCore::ResourceRequest& request() const { return m_request; }
+    void didReceiveAuthenticationChallenge(const WebCore::AuthenticationChallenge&);
+    void didStart();
+    void didReceiveResponse(const WebCore::ResourceResponse&);
+    bool shouldDecodeSourceDataOfMIMEType(const String& mimeType);
+    String decideDestinationWithSuggestedFilename(const String& filename, bool& allowOverwrite);
+    void decideDestinationWithSuggestedFilenameAsync(const String&);
+    void didDecideDownloadDestination(const String& destinationPath, const SandboxExtension::Handle&, bool allowOverwrite);
+    void continueDidReceiveResponse();
+    void platformDidFinish();
+#endif
+    void didCreateDestination(const String& path);
+    void didReceiveData(uint64_t length);
+    void didFinish();
+    void didFail(const WebCore::ResourceError&, const IPC::DataReference& resumeData);
+    void didCancel(const IPC::DataReference& resumeData);
+
+private:
+    // IPC::MessageSender
+    IPC::Connection* messageSenderConnection() override;
+    uint64_t messageSenderDestinationID() override;
+
+#if !USE(NETWORK_SESSION)
+    void startNetworkLoad();
+    void startNetworkLoadWithHandle(WebCore::ResourceHandle*, const WebCore::ResourceResponse&);
+    void platformInvalidate();
+#endif
+    void platformCancelNetworkLoad();
+
+    bool isAlwaysOnLoggingAllowed() const;
+
+    DownloadManager& m_downloadManager;
+    DownloadID m_downloadID;
+
+    Vector<RefPtr<WebCore::BlobDataFileReference>> m_blobFileReferences;
+    RefPtr<SandboxExtension> m_sandboxExtension;
+
+#if USE(NETWORK_SESSION)
+    RefPtr<NetworkDataTask> m_download;
+#if PLATFORM(COCOA)
+    RetainPtr<NSURLSessionDownloadTask> m_downloadTask;
+#endif
+    WebCore::SessionID m_sessionID;
+#else // USE(NETWORK_SESSION)
+    WebCore::ResourceRequest m_request;
+    String m_responseMIMEType;
+#if PLATFORM(COCOA)
+    RetainPtr<NSURLDownload> m_nsURLDownload;
+    RetainPtr<WKDownloadAsDelegate> m_delegate;
+#endif
+#if USE(CFURLCONNECTION)
+    RetainPtr<CFURLDownloadRef> m_download;
+#endif
+    std::unique_ptr<WebCore::ResourceHandleClient> m_downloadClient;
+    RefPtr<WebCore::ResourceHandle> m_resourceHandle;
+#endif // USE(NETWORK_SESSION)
+    String m_suggestedName;
+    bool m_hasReceivedData { false };
+};
+
+} // namespace WebKit
+
+#endif // Download_h