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

sdk/lib/_internal/pub_generated/test/oauth2/utils.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 oauth2.utils;
 
 import 'dart:convert';
 
 import 'package:http/http.dart' as http;
 import 'package:scheduled_test/scheduled_process.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 import 'package:scheduled_test/scheduled_server.dart';
 import 'package:shelf/shelf.dart' as shelf;
 
 import '../../lib/src/utils.dart';
 
 void authorizePub(ScheduledProcess pub, ScheduledServer server,
-    [String accessToken="access token"]) {
-  pub.stdout.expect('Pub needs your authorization to upload packages on your '
-      'behalf.');
+    [String accessToken = "access token"]) {
+  pub.stdout.expect(
+      'Pub needs your authorization to upload packages on your ' 'behalf.');
 
   schedule(() {
     return pub.stdout.next().then((line) {
-      var match = new RegExp(r'[?&]redirect_uri=([0-9a-zA-Z.%+-]+)[$&]')
-          .firstMatch(line);
+      var match =
+          new RegExp(r'[?&]redirect_uri=([0-9a-zA-Z.%+-]+)[$&]').firstMatch(line);
       expect(match, isNotNull);
 
       var redirectUrl = Uri.parse(Uri.decodeComponent(match.group(1)));
-      redirectUrl = addQueryParameters(redirectUrl, {'code': 'access code'});
-      return (new http.Request('GET', redirectUrl)..followRedirects = false)
-        .send();
+      redirectUrl = addQueryParameters(redirectUrl, {
+        'code': 'access code'
+      });
+      return (new http.Request('GET', redirectUrl)..followRedirects =
+          false).send();
     }).then((response) {
-      expect(response.headers['location'],
+      expect(
+          response.headers['location'],
           equals('http://pub.dartlang.org/authorized'));
     });
   });
 
   handleAccessTokenRequest(server, accessToken);
 }
 
 void handleAccessTokenRequest(ScheduledServer server, String accessToken) {
   server.handle('POST', '/token', (request) {
     return request.readAsString().then((body) {
       expect(body, matches(new RegExp(r'(^|&)code=access\+code(&|$)')));
 
       return new shelf.Response.ok(JSON.encode({
         "access_token": accessToken,
         "token_type": "bearer"
-      }), headers: {'content-type': 'application/json'});
+      }), headers: {
+        'content-type': 'application/json'
+      });
     });
   });
 }