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

sdk/lib/_internal/pub_generated/test/run/runs_the_script_in_checked_mode_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS 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';
 
 const SCRIPT = """
 main() {
   int a = true;
 }
 """;
 
 main() {
   initConfig();
   integration('runs the script in checked mode by default', () {
-    d.dir(appPath, [
-      d.appPubspec(),
-      d.dir("bin", [
-        d.file("script.dart", SCRIPT)
-      ])
-    ]).create();
+    d.dir(
+        appPath,
+        [d.appPubspec(), d.dir("bin", [d.file("script.dart", SCRIPT)])]).create();
 
-    schedulePub(args: ["run", "script"],
+    schedulePub(
+        args: ["run", "script"],
         error: contains("'bool' is not a subtype of type 'int' of 'a'"),
         exitCode: 255);
   });
 }