Ensure that stack traces are propagated more often in dart:io.

sdk/lib/io/file_impl.dart

Index: sdk/lib/io/file_impl.dart
diff --git a/sdk/lib/io/file_impl.dart b/sdk/lib/io/file_impl.dart
index 34e03ded1a8a511de20d362ee2cd38badcc5ce8b..2dac1b84d7e65a741a43b8423456b621fc2807ab 100644
--- a/sdk/lib/io/file_impl.dart
+++ b/sdk/lib/io/file_impl.dart
@@ -208,9 +208,7 @@ class _FileStreamConsumer extends StreamConsumer<List<int>> {
           onError: error,
           cancelOnError: true);
       })
-      .catchError((e) {
-        completer.completeError(e);
-      });
+      .catchError(completer.completeError);
     return completer.future;
   }