Use native async/await support in pub.

sdk/lib/_internal/pub_generated/test/lish/utils.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.
-
-library lish.utils;
-
-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 '../../lib/src/io.dart';
-
-void handleUploadForm(ScheduledServer server, [Map body]) {
-  server.handle('GET', '/api/packages/versions/new', (request) {
-    return server.url.then((url) {
-      expect(
-          request.headers,
-          containsPair('authorization', 'Bearer access token'));
-
-      if (body == null) {
-        body = {
-          'url': url.resolve('/upload').toString(),
-          'fields': {
-            'field1': 'value1',
-            'field2': 'value2'
-          }
-        };
-      }
-
-      return new shelf.Response.ok(JSON.encode(body), headers: {
-        'content-type': 'application/json'
-      });
-    });
-  });
-}
-
-void handleUpload(ScheduledServer server) {
-  server.handle('POST', '/upload', (request) {
-    // TODO(nweiz): Once a multipart/form-data parser in Dart exists, validate
-    // that the request body is correctly formatted. See issue 6952.
-    return drainStream(
-        request.read()).then(
-            (_) =>
-                server.url).then((url) => new shelf.Response.found(url.resolve('/create')));
-  });
-}
-