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

sdk/lib/_internal/pub_generated/test/transformer/prefers_transformer_to_library_name_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 '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
@@ skipping 13 matching lines @@
       transform.addOutput(new Asset.fromString(id, "\$contents.wrong"));
     });
   }
 }
 """;
 
 main() {
   initConfig();
   withBarbackVersions("any", () {
     integration("prefers transformer.dart to <package name>.dart", () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
           "transformers": ["myapp"]
         }),
-        d.dir("lib", [
-          d.file("transformer.dart", REWRITE_TRANSFORMER),
-          d.file("myapp.dart", WRONG_TRANSFORMER)
-        ]),
-        d.dir("web", [
-          d.file("foo.txt", "foo")
-        ])
-      ]).create();
+            d.dir(
+                "lib",
+                [
+                    d.file("transformer.dart", REWRITE_TRANSFORMER),
+                    d.file("myapp.dart", WRONG_TRANSFORMER)]),
+            d.dir("web", [d.file("foo.txt", "foo")])]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
       pubServe();
       requestShouldSucceed("foo.out", "foo.out");
       requestShould404("foo.wrong");
       endPubServe();
     });
   });
 }