Replace the DownloadFileManager with direct ownership

content/public/browser/download_manager.h

 // Copyright (c) 2012 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.
 //
 // The DownloadManager object manages the process of downloading, including
 // updates to the history system and providing the information for displaying
 // the downloads view in the Destinations tab. There is one DownloadManager per
 // active browser context in Chrome.
 //
 // Download observers:
@@ skipping 109 matching lines @@
   virtual bool Init(BrowserContext* browser_context) = 0;
 
   // Called by a download source (Currently DownloadResourceHandler)
   // to initiate the non-source portions of a download.
   // Returns the id assigned to the download.  If the DownloadCreateInfo
   // specifies an id, that id will be used.
   virtual content::DownloadId StartDownload(
       scoped_ptr<DownloadCreateInfo> info,
       scoped_ptr<content::ByteStreamReader> stream) = 0;
 
-  // Notifications sent from the download thread to the UI thread
-  virtual void UpdateDownload(int32 download_id,
-                              int64 bytes_so_far,
-                              int64 bytes_per_sec,
-                              const std::string& hash_state) = 0;
-
-  // |download_id| is the ID of the download.
-  // |size| is the number of bytes that have been downloaded.
-  // |hash| is sha256 hash for the downloaded file. It is empty when the hash
-  // is not available.
-  virtual void OnResponseCompleted(int32 download_id, int64 size,
-                           const std::string& hash) = 0;
-
   // Offthread target for cancelling a particular download.  Will be a no-op
   // if the download has already been cancelled.
   virtual void CancelDownload(int32 download_id) = 0;
 
-  // Called when there is an error in the download.
-  // |download_id| is the ID of the download.
-  // |size| is the number of bytes that are currently downloaded.
-  // |hash_state| is the current state of the hash of the data that has been
-  // downloaded.
-  // |reason| is a download interrupt reason code.
-  virtual void OnDownloadInterrupted(
-      int32 download_id,
-      DownloadInterruptReason reason) = 0;
-
   // Remove downloads after remove_begin (inclusive) and before remove_end
   // (exclusive). You may pass in null Time values to do an unbounded delete
   // in either direction.
   virtual int RemoveDownloadsBetween(base::Time remove_begin,
                                      base::Time remove_end) = 0;
 
   // Remove downloads will delete all downloads that have a timestamp that is
   // the same or more recent than |remove_begin|. The number of downloads
   // deleted is returned back to the caller.
   virtual int RemoveDownloads(base::Time remove_begin) = 0;
@@ skipping 64 matching lines @@
  protected:
   virtual ~DownloadManager() {}
 
  private:
   friend class base::RefCountedThreadSafe<DownloadManager>;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_DOWNLOAD_MANAGER_H_