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

content/browser/download/download_net_log_parameters.cc

Index: content/browser/download/download_net_log_parameters.cc
diff --git a/content/browser/download/download_net_log_parameters.cc b/content/browser/download/download_net_log_parameters.cc
index 00a9d5dee77393c8b9ea9ad0bdbe5a5da2330a8f..53738eb40f7617838045a7ed4643c571bf619b5e 100644
--- a/content/browser/download/download_net_log_parameters.cc
+++ b/content/browser/download/download_net_log_parameters.cc
@@ -183,4 +183,15 @@ base::Value* FileErrorCallback(const char* operation,
   return dict;
 }
 
+base::Value* AnnotateWithSourceCallback(int os_error,
+                                        net::Error net_error,
+                                        net::NetLog::LogLevel /* log level */) {
+  DictionaryValue* dict = new DictionaryValue();
+
+  dict->SetInteger("os_error", os_error);
+  dict->SetInteger("net_error", net_error);
+
+  return dict;
+}
+
 }  // namespace download_net_logs