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

content/browser/renderer_host/resource_dispatcher_host_impl.h

Index: content/browser/renderer_host/resource_dispatcher_host_impl.h
===================================================================
--- content/browser/renderer_host/resource_dispatcher_host_impl.h	(revision 154444)
+++ content/browser/renderer_host/resource_dispatcher_host_impl.h	(working copy)
@@ -35,6 +35,7 @@
 #include "net/url_request/url_request.h"
 #include "webkit/glue/resource_type.h"
 
+class DownloadFileManager;
 class ResourceHandler;
 class SaveFileManager;
 class WebContentsImpl;
@@ -143,6 +144,10 @@
   // request. Experimentally obtained.
   static const int kAvgBytesPerOutstandingRequest = 4400;
 
+  DownloadFileManager* download_file_manager() const {
+    return download_file_manager_;
+  }
+
   SaveFileManager* save_file_manager() const {
     return save_file_manager_;
   }
@@ -351,6 +356,9 @@
   scoped_ptr<base::RepeatingTimer<ResourceDispatcherHostImpl> >
       update_load_states_timer_;
 
+  // We own the download file writing thread and manager
+  scoped_refptr<DownloadFileManager> download_file_manager_;
+
   // We own the save file manager.
   scoped_refptr<SaveFileManager> save_file_manager_;