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

sdk/lib/_internal/pub_generated/test/oauth2/with_a_malformed_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 'package:scheduled_test/scheduled_test.dart';
 import 'package:scheduled_test/scheduled_server.dart';
 import 'package:shelf/shelf.dart' as shelf;
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 main() {
   initConfig();
-  integration('with a malformed credentials.json, authenticates again and '
-      'saves credentials.json', () {
+  integration(
+      'with a malformed credentials.json, authenticates again and '
+          'saves credentials.json',
+      () {
     d.validPackage.create();
 
     var server = new ScheduledServer();
-    d.dir(cachePath, [
-      d.file('credentials.json', '{bad json')
-    ]).create();
+    d.dir(cachePath, [d.file('credentials.json', '{bad json')]).create();
 
     var pub = startPublish(server);
     confirmPublish(pub);
     authorizePub(pub, server, "new access token");
 
     server.handle('GET', '/api/packages/versions/new', (request) {
-      expect(request.headers,
+      expect(
+          request.headers,
           containsPair('authorization', 'Bearer new access token'));
 
       return new shelf.Response(200);
     });
 
     // After we give pub an invalid response, it should crash. We wait for it to
     // do so rather than killing it so it'll write out the credentials file.
     pub.shouldExit(1);
 
     d.credentialsFile(server, 'new access token').validate();
   });
-}
+}