[Downloads] Factor out request handling logic between DRH and UD.

content/browser/download/url_downloader.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_DOWNLOAD_URL_DOWNLOADER_H_
 #define CONTENT_BROWSER_DOWNLOAD_URL_DOWNLOADER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "content/browser/download/download_request_core.h"
 #include "content/public/browser/download_save_info.h"
 #include "content/public/browser/download_url_parameters.h"
 #include "content/public/common/referrer.h"
 #include "net/url_request/redirect_info.h"
 #include "net/url_request/url_request.h"
 
 namespace content {
 class DownloadManagerImpl;
-class DownloadRequestCore;
 
 class UrlDownloader : public net::URLRequest::Delegate {
  public:
-  UrlDownloader(scoped_ptr<net::URLRequest> request,
-                scoped_ptr<DownloadRequestCore> handler,
-                base::WeakPtr<DownloadManagerImpl> manager);
+  UrlDownloader(
+      scoped_ptr<net::URLRequest> request,
+      base::WeakPtr<DownloadManagerImpl> manager,
+      scoped_ptr<DownloadSaveInfo> save_info,
+      uint32 download_id,
+      const DownloadUrlParameters::OnStartedCallback& on_started_callback);
   ~UrlDownloader() override;
 
   static scoped_ptr<UrlDownloader> BeginDownload(
       base::WeakPtr<DownloadManagerImpl> download_manager,
       scoped_ptr<net::URLRequest> request,
       const Referrer& referrer,
-      bool is_content_initiated,
       bool prefer_cache,
-      bool do_not_prompt_for_login,
       scoped_ptr<DownloadSaveInfo> save_info,
       uint32 download_id,
       const DownloadUrlParameters::OnStartedCallback& started_callback);
 
   // URLRequest::Delegate:
   void OnReceivedRedirect(net::URLRequest* request,
                           const net::RedirectInfo& redirect_info,
                           bool* defer_redirect) override;
   void OnResponseStarted(net::URLRequest* request) override;
   void OnReadCompleted(net::URLRequest* request, int bytes_read) override;
 
   void StartReading(bool is_continuation);
   void ResponseCompleted();
 
   void Start();
   void ResumeReading();
 
+  void CallStartedCallbackOnFailure(DownloadInterruptReason result);
+
  private:
+  class RequestHandle;
+
+  void PauseRequest();
+  void ResumeRequest();
+  void CancelRequest();
+
   scoped_ptr<net::URLRequest> request_;
-  scoped_ptr<DownloadRequestCore> handler_;
   base::WeakPtr<DownloadManagerImpl> manager_;
+  uint32 download_id_;
+  DownloadUrlParameters::OnStartedCallback on_started_callback_;
+
+  DownloadRequestCore handler_;
 
   base::WeakPtrFactory<UrlDownloader> weak_ptr_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_URL_DOWNLOADER_H_