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

sdk/lib/_internal/pub_generated/test/lish/upload_form_provides_invalid_json_test.dart

 // Copyright (c) 2013, 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';
 
 main() {
   initConfig();
   setUp(d.validPackage.create);
 
   integration('upload form provides invalid JSON', () {
     var server = new ScheduledServer();
     d.credentialsFile(server, 'access token').create();
     var pub = startPublish(server);
 
     confirmPublish(pub);
 
-    server.handle('GET', '/api/packages/versions/new',
+    server.handle(
+        'GET',
+        '/api/packages/versions/new',
         (request) => new shelf.Response.ok('{not json'));
 
-    pub.stderr.expect(emitsLines(
-        'Invalid server response:\n'
-        '{not json'));
+    pub.stderr.expect(emitsLines('Invalid server response:\n' '{not json'));
     pub.shouldExit(1);
   });
 }