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

sdk/lib/_internal/pub_generated/test/oauth2/with_server_rejected_credentials_authenticates_again_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.
 
 import 'dart:convert';
 
 import 'package:scheduled_test/scheduled_server.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:shelf/shelf.dart' as shelf;
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
   initConfig();
-  integration('with server-rejected credentials, authenticates again and saves '
-      'credentials.json', () {
+  integration(
+      'with server-rejected credentials, authenticates again and saves '
+          'credentials.json',
+      () {
     d.validPackage.create();
     var server = new ScheduledServer();
     d.credentialsFile(server, 'access token').create();
     var pub = startPublish(server);
 
     confirmPublish(pub);
 
     server.handle('GET', '/api/packages/versions/new', (request) {
-      return new shelf.Response(401,
-          body: JSON.encode({'error': {'message': 'your token sucks'}}),
-          headers: {
+      return new shelf.Response(401, body: JSON.encode({
+        'error': {
+          'message': 'your token sucks'
+        }
+      }), headers: {
         'www-authenticate': 'Bearer error="invalid_token",'
             ' error_description="your token sucks"'
       });
     });
 
     pub.stderr.expect('OAuth2 authorization failed (your token sucks).');
     pub.stdout.expect(startsWith('Uploading...'));
     pub.kill();
   });
 }