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

sdk/lib/_internal/pub_generated/test/dart2js/converts_isolate_entrypoint_in_web_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.
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import '../serve/utils.dart';
 
 main() {
   initConfig();
   integration("converts a Dart isolate entrypoint in web to JS", () {
     // Increase the timeout because dart2js takes a lot longer than usual to
     // compile isolate entrypoints.
     currentSchedule.timeout *= 2;
 
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir("web", [
-        d.file("isolate.dart", "void main(List<String> args, SendPort "
-            "sendPort) => print('hello');")
-      ])
-    ]).create();
+    d.dir(
+        appPath,
+        [
+            d.appPubspec(),
+            d.dir(
+                "web",
+                [
+                    d.file(
+                        "isolate.dart",
+                        "void main(List<String> args, SendPort "
+                            "sendPort) => print('hello');")])]).create();
 
     pubServe();
     requestShouldSucceed("isolate.dart.js", contains("hello"));
     endPubServe();
   });
 }