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

sdk/lib/_internal/pub_generated/test/oauth2/with_an_expired_credentials_refreshes_and_saves_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_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();
-  integration('with an expired credentials.json, refreshes and saves the '
-      'refreshed access token to credentials.json', () {
+  integration(
+      'with an expired credentials.json, refreshes and saves the '
+          'refreshed access token to credentials.json',
+      () {
     d.validPackage.create();
 
     var server = new ScheduledServer();
-    d.credentialsFile(server, 'access token',
+    d.credentialsFile(
+        server,
+        'access token',
         refreshToken: 'refresh token',
-        expiration: new DateTime.now().subtract(new Duration(hours: 1)))
-        .create();
+        expiration: new DateTime.now().subtract(new Duration(hours: 1))).create();
 
     var pub = startPublish(server);
     confirmPublish(pub);
 
     server.handle('POST', '/token', (request) {
       return request.readAsString().then((body) {
-        expect(body, matches(
-            new RegExp(r'(^|&)refresh_token=refresh\+token(&|$)')));
+        expect(
+            body,
+            matches(new RegExp(r'(^|&)refresh_token=refresh\+token(&|$)')));
 
         return new shelf.Response.ok(JSON.encode({
           "access_token": "new access token",
           "token_type": "bearer"
-        }), headers: {'content-type': 'application/json'});
+        }), headers: {
+          'content-type': 'application/json'
+        });
       });
     });
 
     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);
     });
 
     pub.shouldExit();
 
-    d.credentialsFile(server, 'new access token', refreshToken: 'refresh token')
-        .validate();
+    d.credentialsFile(
+        server,
+        'new access token',
+        refreshToken: 'refresh token').validate();
   });
-}
+}