Revert "Use native async/await support in pub."

sdk/lib/_internal/pub_generated/test/transformer/fails_to_load_a_pubspec_with_reserved_transformer_test.dart

 // Copyright (c) 2013, 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.
 
 library pub_tests;
 
 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 '../serve/utils.dart';
 
 main() {
   initConfig();
 
   withBarbackVersions("any", () {
     integration("fails to load a pubspec with reserved transformer", () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
           "transformers": ["\$nonexistent"]
         }),
-        d.dir("lib", [d.dir("src", [
-          d.file("transformer.dart", REWRITE_TRANSFORMER)
-        ])])
-      ]).create();
+            d.dir(
+                "lib",
+                [d.dir("src", [d.file("transformer.dart", REWRITE_TRANSFORMER)])])]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
       var pub = startPubServe();
-      pub.stderr.expect(contains('Invalid transformer config: Unsupported '
-          'built-in transformer \$nonexistent.'));
+      pub.stderr.expect(
+          contains(
+              'Invalid transformer config: Unsupported '
+                  'built-in transformer \$nonexistent.'));
       pub.shouldExit(exit_codes.DATA);
     });
   });
 }