Replace the DownloadFileManager with direct ownership of DownloadFileImpl

content/browser/download/download_create_info.h

Index: content/browser/download/download_create_info.h
diff --git a/content/browser/download/download_create_info.h b/content/browser/download/download_create_info.h
index 4e0cc3f6fce5fa96077179fc80454b67370986fa..9c5e11f5e3aae88d106c723fa657ea7e11ae2a57 100644
--- a/content/browser/download/download_create_info.h
+++ b/content/browser/download/download_create_info.h
@@ -107,13 +107,6 @@ struct CONTENT_EXPORT DownloadCreateInfo {
   // The handle to the URLRequest sourcing this download.
   DownloadRequestHandle request_handle;
 
-  // Default directory to use for this download. The final target path may not
-  // be determined until much later. In the meantime, this directory (if
-  // non-empty) should be used to store teh download file.
-  // TODO(asanka,rdsmith): Get rid of this when we start creating the
-  //                       DownloadFile on the UI thread.
-  FilePath default_download_directory;
-
   // The request's |BoundNetLog|, for "source_dependency" linking with the
   // download item's.
   const net::BoundNetLog request_bound_net_log;