Allow dragging a download only after the download is complete.

chrome/browser/download/download_util.cc

Index: chrome/browser/download/download_util.cc
diff --git a/chrome/browser/download/download_util.cc b/chrome/browser/download/download_util.cc
index 90d045b90270df579dbd6eb74d244452b24c81b3..26a05a5913bbdce8b79fa9993fa02988b284503b 100644
--- a/chrome/browser/download/download_util.cc
+++ b/chrome/browser/download/download_util.cc
@@ -348,6 +348,7 @@ void DragDownload(const DownloadItem* download,
                   gfx::Image* icon,
                   gfx::NativeView view) {
   DCHECK(download);
+  DCHECK(download->IsComplete());
 
   // Set up our OLE machinery
   ui::OSExchangeData data;
@@ -357,7 +358,7 @@ void DragDownload(const DownloadItem* download,
         download->GetFileNameToReportUser(), icon->ToImageSkia(), &data);
   }
 
-  const FilePath full_path = download->GetFullPath();
+  const FilePath full_path = download->GetTargetFilePath();
   data.SetFilename(full_path);
 
   std::string mime_type = download->GetMimeType();