Shift passage of FileStream in downloads system to be by scoped_ptr<>.

content/browser/web_contents/web_contents_drag_win.cc

Index: content/browser/web_contents/web_contents_drag_win.cc
diff --git a/content/browser/web_contents/web_contents_drag_win.cc b/content/browser/web_contents/web_contents_drag_win.cc
index 50d3e1d0a7b0b498c06a0a0d5ec1b62c480e2c6a..7920b4d604bbcd078a3481d92a373524a79e0811 100644
--- a/content/browser/web_contents/web_contents_drag_win.cc
+++ b/content/browser/web_contents/web_contents_drag_win.cc
@@ -250,11 +250,10 @@ void WebContentsDragWin::PrepareDragForDownload(
 
   // Provide the data as file (CF_HDROP). A temporary download file with the
   // Zone.Identifier ADS (Alternate Data Stream) attached will be created.
-  linked_ptr<net::FileStream> empty_file_stream;
   scoped_refptr<DragDownloadFile> download_file =
       new DragDownloadFile(
           generated_download_file_name,
-          empty_file_stream,
+          scoped_ptr<net::FileStream>(),
           download_url,
           content::Referrer(page_url, drop_data.referrer_policy),
           page_encoding,