Revert 154294 - Remove DownloadFileManager in favor of direct ownership of DownloadFiles.

content/public/browser/download_manager.h

Index: content/public/browser/download_manager.h
===================================================================
--- content/public/browser/download_manager.h	(revision 154444)
+++ content/public/browser/download_manager.h	(working copy)
@@ -132,10 +132,33 @@
       scoped_ptr<DownloadCreateInfo> info,
       scoped_ptr<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.