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

sdk/lib/_internal/pub_generated/test/transformer/exclusion/works_on_dart2js_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 'package:scheduled_test/scheduled_stream.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 import '../../serve/utils.dart';
 
 main() {
   initConfig();
   withBarbackVersions("any", () {
     integration("works on the dart2js transformer", () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
-          "transformers": [
-            {
+          "transformers": [{
               "\$dart2js": {
                 "\$include": ["web/a.dart", "web/b.dart"],
                 "\$exclude": "web/a.dart"
               }
-            }
-          ]
+            }]
         }),
-        d.dir("web", [
-          d.file("a.dart", "void main() => print('hello');"),
-          d.file("b.dart", "void main() => print('hello');"),
-          d.file("c.dart", "void main() => print('hello');")
-        ])
-      ]).create();
+            d.dir(
+                "web",
+                [
+                    d.file("a.dart", "void main() => print('hello');"),
+                    d.file("b.dart", "void main() => print('hello');"),
+                    d.file("c.dart", "void main() => print('hello');")])]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
       var server = pubServe();
       // Dart2js should remain lazy.
       server.stdout.expect("Build completed successfully");
 
       requestShould404("a.dart.js");
       requestShouldSucceed("b.dart.js", isNot(isEmpty));
-      server.stdout.expect(consumeThrough(emitsLines(
-          "[Info from Dart2JS]:\n"
-          "Compiling myapp|web/b.dart...")));
+      server.stdout.expect(
+          consumeThrough(
+              emitsLines("[Info from Dart2JS]:\n" "Compiling myapp|web/b.dart...")));
       server.stdout.expect(consumeThrough("Build completed successfully"));
 
       requestShould404("c.dart.js");
       endPubServe();
     });
   });
 }