Revert "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.');
-
-  schedule(() {
-    return pub.stdout.next().then((line) {
-      var match =
-          new RegExp(r'[?&]redirect_uri=([0-9a-zA-Z.%+-]+)[$&]').firstMatch(line);
-      expect(match, isNotNull);
-
-      var redirectUrl = Uri.parse(Uri.decodeComponent(match.group(1)));
-      redirectUrl = addQueryParameters(redirectUrl, {
-        'code': 'access code'
-      });
-      return (new http.Request('GET', redirectUrl)..followRedirects =
-          false).send();
-    }).then((response) {
-      expect(
-          response.headers['location'],
-          equals('http://pub.dartlang.org/authorized'));
-    });
-  });
-
-  handleAccessTokenRequest(server, accessToken);
-}
-
-void handleAccessTokenRequest(ScheduledServer server, String accessToken) {
-  server.handle('POST', '/token', (request) {
-    return request.readAsString().then((body) {
-      expect(body, matches(new RegExp(r'(^|&)code=access\+code(&|$)')));
-
-      return new shelf.Response.ok(JSON.encode({
-        "access_token": accessToken,
-        "token_type": "bearer"
-      }), headers: {
-        'content-type': 'application/json'
-      });
-    });
-  });
-}
-