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

sdk/lib/_internal/pub_generated/test/transformer/loads_an_aggregate_transformer_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.
 
 library pub_tests;
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
@@ skipping 21 matching lines @@
       transform.addOutput(new Asset.fromString(id, contents.join('\\n')));
     });
   }
 }
 """;
 
 main() {
   initConfig();
   withBarbackVersions(">=0.14.1", () {
     integration("loads an aggregate transformer", () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
           "transformers": ["myapp"]
         }),
-        d.dir("lib", [
-          d.file("transformer.dart", AGGREGATE_TRANSFORMER),
-        ]),
-        d.dir("web", [
-          d.file("foo.txt", "foo"),
-          d.file("bar.txt", "bar")
-        ])
-      ]).create();
+            d.dir("lib", [d.file("transformer.dart", AGGREGATE_TRANSFORMER),]),
+            d.dir("web", [d.file("foo.txt", "foo"), d.file("bar.txt", "bar")])]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
       pubServe();
       requestShouldSucceed("out.txt", "bar\nfoo");
       endPubServe();
     });
   });
 }