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

sdk/lib/_internal/pub_generated/test/serve/unknown_dependency_test.dart

Index: sdk/lib/_internal/pub_generated/test/serve/unknown_dependency_test.dart
diff --git a/sdk/lib/_internal/pub/test/serve/unknown_dependency_test.dart b/sdk/lib/_internal/pub_generated/test/serve/unknown_dependency_test.dart
similarity index 60%
copy from sdk/lib/_internal/pub/test/serve/unknown_dependency_test.dart
copy to sdk/lib/_internal/pub_generated/test/serve/unknown_dependency_test.dart
index 9f529584e5a56995063acebc1f941dbae6a28036..b3f78d55cbd65c39499fa73395f547b3e13a548c 100644
--- a/sdk/lib/_internal/pub/test/serve/unknown_dependency_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/serve/unknown_dependency_test.dart
@@ -1,20 +1,11 @@
-// 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.
-
 library pub_tests;
-
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
-
 main() {
   initConfig();
   integration("responds with a 404 unknown dependencies", () {
-    d.dir(appPath, [
-      d.appPubspec()
-    ]).create();
-
+    d.dir(appPath, [d.appPubspec()]).create();
     pubServe();
     requestShould404("packages/foo/nope.dart");
     requestShould404("assets/foo/nope.png");