Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/test/barback/fails_if_no_default_dirs_test.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
 import 'package:scheduled_test/scheduled_test.dart';
-
 import '../../lib/src/exit_codes.dart' as exit_codes;
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
-
 main() {
   initConfig();
-
   setUp(() {
     d.appDir().create();
   });
-
-  pubBuildAndServeShouldFail("if no directories were passed and no default "
-          "ones exist",
+  pubBuildAndServeShouldFail(
+      "if no directories were passed and no default " "ones exist",
       args: [],
       buildError: 'Your package must have a "web" directory,\n'
           'or you must specify the source directories.',
       serveError: 'Your package must have "web" and/or "test" directories,\n'
           'or you must specify the source directories.',
       exitCode: exit_codes.DATA);
 }