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

content/browser/download/base_file_mac.cc

Index: content/browser/download/base_file_mac.cc
diff --git a/content/browser/download/base_file_mac.cc b/content/browser/download/base_file_mac.cc
index 88ad5f0c530ff96035ba6c5548d04205be61c101..f286bf722cfacd32243030acbb90def19b51b554 100644
--- a/content/browser/download/base_file_mac.cc
+++ b/content/browser/download/base_file_mac.cc
@@ -7,10 +7,11 @@
 #include "content/browser/download/file_metadata_mac.h"
 #include "content/public/browser/browser_thread.h"
 
-void BaseFile::AnnotateWithSourceInformation() {
+content::DownloadInterruptReason BaseFile::AnnotateWithSourceInformation() {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
   DCHECK(!detached_);
 
   content::AddQuarantineMetadataToFile(full_path_, source_url_, referrer_url_);
   content::AddOriginMetadataToFile(full_path_, source_url_, referrer_url_);
+  return content::DOWNLOAD_INTERRUPT_REASON_NONE;
 }