Store the async-await compiled pub code directly in the repo.

sdk/lib/_internal/pub_generated/test/lish/preview_errors_if_private_test.dart

Index: sdk/lib/_internal/pub_generated/test/lish/preview_errors_if_private_test.dart
diff --git a/sdk/lib/_internal/pub/test/lish/preview_errors_if_private_test.dart b/sdk/lib/_internal/pub_generated/test/lish/preview_errors_if_private_test.dart
similarity index 65%
copy from sdk/lib/_internal/pub/test/lish/preview_errors_if_private_test.dart
copy to sdk/lib/_internal/pub_generated/test/lish/preview_errors_if_private_test.dart
index 5884c1e561b84327f1f017558b3a4d3ebd9c8741..69468cd1e4ffe3c884d8435fa0cc9eb8efdbf017 100644
--- a/sdk/lib/_internal/pub/test/lish/preview_errors_if_private_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/lish/preview_errors_if_private_test.dart
@@ -1,21 +1,15 @@
-// Copyright (c) 2014, 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.
-
 import 'package:scheduled_test/scheduled_test.dart';
-
 import '../../lib/src/exit_codes.dart' as exit_codes;
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
-
 main() {
   initConfig();
   integration('preview shows an error if the package is private', () {
     var pkg = packageMap("test_pkg", "1.0.0");
     pkg["publish_to"] = "none";
     d.dir(appPath, [d.pubspec(pkg)]).create();
-
-    schedulePub(args: ["lish", "--dry-run"],
+    schedulePub(
+        args: ["lish", "--dry-run"],
         error: startsWith("A private package cannot be published."),
         exitCode: exit_codes.DATA);
   });