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

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

Index: sdk/lib/_internal/pub_generated/test/barback/fails_on_disallowed_directories_test.dart
diff --git a/sdk/lib/_internal/pub/test/barback/fails_on_disallowed_directories_test.dart b/sdk/lib/_internal/pub_generated/test/barback/fails_on_disallowed_directories_test.dart
similarity index 61%
copy from sdk/lib/_internal/pub/test/barback/fails_on_disallowed_directories_test.dart
copy to sdk/lib/_internal/pub_generated/test/barback/fails_on_disallowed_directories_test.dart
index a57d8e7db545cd8621ee0abe6507224660349e25..a16e7a6f5851b2d7a3ad2501aa0d240027281c3f 100644
--- a/sdk/lib/_internal/pub/test/barback/fails_on_disallowed_directories_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/barback/fails_on_disallowed_directories_test.dart
@@ -1,24 +1,17 @@
-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS 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:path/path.dart' as path;
 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();
   });
-
   var libSub = path.join("lib", "sub");
-  pubBuildAndServeShouldFail("if given directories are not allowed",
+  pubBuildAndServeShouldFail(
+      "if given directories are not allowed",
       args: [libSub, "lib"],
       error: 'Directories "$libSub" and "lib" are not allowed.',
       exitCode: exit_codes.USAGE);