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

sdk/lib/_internal/pub_generated/test/hosted/fail_gracefully_on_url_resolve_test.dart

 // Copyright (c) 2012, 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.
 
 library pub_tests;
 
 import '../../lib/src/exit_codes.dart' as exit_codes;
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
   initConfig();
 
   forBothPubGetAndUpgrade((command) {
     integration('fails gracefully if the url does not resolve', () {
-      d.dir(appPath, [
-        d.appPubspec({
+      d.dir(appPath, [d.appPubspec({
           "foo": {
             "hosted": {
               "name": "foo",
               "url": "http://pub.invalid"
             }
           }
-        })
-      ]).create();
+        })]).create();
 
-      pubCommand(command, error: 'Could not resolve URL "http://pub.invalid".',
+      pubCommand(
+          command,
+          error: 'Could not resolve URL "http://pub.invalid".',
           exitCode: exit_codes.UNAVAILABLE);
     });
   });
 }