Handle the case where IAttachmentExecute::Save() deletes a downloaded file.

content/browser/download/base_file.h

Index: content/browser/download/base_file.h
diff --git a/content/browser/download/base_file.h b/content/browser/download/base_file.h
index 885c79df738aa624318c59ecf14be289f245d2f3..3ebedb2c5df7a9b95205c994c0ee439578a553c3 100644
--- a/content/browser/download/base_file.h
+++ b/content/browser/download/base_file.h
@@ -65,7 +65,7 @@ class CONTENT_EXPORT BaseFile {
   void Finish();
 
   // Informs the OS that this file came from the internet.
-  void AnnotateWithSourceInformation();
+  net::Error AnnotateWithSourceInformation();
 
   // Calculate and return the current speed in bytes per second.
   int64 CurrentSpeed() const;