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

sdk/lib/_internal/pub_generated/test/dart2js/compiles_generated_dart_file_test.dart

Index: sdk/lib/_internal/pub_generated/test/dart2js/compiles_generated_dart_file_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/dart2js/compiles_generated_dart_file_test.dart b/sdk/lib/_internal/pub_generated/test/dart2js/compiles_generated_dart_file_test.dart
deleted file mode 100644
index 0354e436ecc4b670a07a38ead80e690f81fa024e..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/test/dart2js/compiles_generated_dart_file_test.dart
+++ /dev/null
@@ -1,33 +0,0 @@
-// Copyright (c) 2013, 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.
-
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-import '../serve/utils.dart';
-
-main() {
-  initConfig();
-  withBarbackVersions("any", () {
-    integration("compiles a generated Dart file to JS", () {
-      d.dir(appPath, [d.pubspec({
-          "name": "myapp",
-          "version": "0.0.1",
-          "transformers": ["myapp/transformer"]
-        }),
-            d.dir("lib", [d.file("transformer.dart", dartTransformer("munge"))]),
-            d.dir("web", [d.file("main.dart", """
-const TOKEN = "before";
-void main() => print(TOKEN);
-""")])]).create();
-
-      createLockFile('myapp', pkg: ['barback']);
-
-      pubServe();
-      requestShouldSucceed("main.dart.js", contains("(before, munge)"));
-      endPubServe();
-    });
-  });
-}