Use native async/await support in pub.

sdk/lib/_internal/pub_generated/test/transformer/supports_a_transformer_that_doesnt_return_futures_test.dart

-// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.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 pub_tests;
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-import '../serve/utils.dart';
-
-const TRANSFORMER = """
-import 'dart:async';
-
-import 'package:barback/barback.dart';
-
-class RewriteTransformer extends Transformer implements DeclaringTransformer {
-  RewriteTransformer.asPlugin();
-
-  bool isPrimary(AssetId id) => id.extension == '.txt';
-
-  void apply(Transform transform) {
-    transform.addOutput(new Asset.fromString(
-        transform.primaryInput.id, "new contents"));
-  }
-
-  void declareOutputs(DeclaringTransform transform) {
-    transform.declareOutput(transform.primaryId);
-  }
-}
-""";
-
-main() {
-  initConfig();
-  withBarbackVersions("any", () {
-    integration("supports a transformer that doesn't return futures", () {
-      d.dir(appPath, [d.pubspec({
-          "name": "myapp",
-          "transformers": ["myapp/src/transformer"]
-        }),
-            d.dir("lib", [d.dir("src", [d.file("transformer.dart", TRANSFORMER)])]),
-            d.dir("web", [d.file("foo.txt", "foo")])]).create();
-
-      createLockFile('myapp', pkg: ['barback']);
-
-      pubServe();
-      requestShouldSucceed("foo.txt", "new contents");
-      endPubServe();
-    });
-  });
-}