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

sdk/lib/_internal/pub_generated/test/serve/supports_user_defined_lazy_transformers_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 'utils.dart';
 
 main() {
   initConfig();
   withBarbackVersions("any", () {
     integration("supports a user-defined lazy transformer", () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
           "transformers": ["myapp/src/transformer"]
         }),
-        d.dir("lib", [d.dir("src", [
-          d.file("transformer.dart", LAZY_TRANSFORMER)
-        ])]),
-        d.dir("web", [
-          d.file("foo.txt", "foo")
-        ])
-      ]).create();
+            d.dir("lib", [d.dir("src", [d.file("transformer.dart", LAZY_TRANSFORMER)])]),
+            d.dir("web", [d.file("foo.txt", "foo")])]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
       var server = pubServe();
       // The build should complete without the transformer logging anything.
       server.stdout.expect('Build completed successfully');
 
       requestShouldSucceed("foo.out", "foo.out");
-      server.stdout.expect(emitsLines(
-          '[Info from LazyRewrite]:\n'
-          'Rewriting myapp|web/foo.txt.'));
+      server.stdout.expect(
+          emitsLines('[Info from LazyRewrite]:\n' 'Rewriting myapp|web/foo.txt.'));
       endPubServe();
     });
   });
 }