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

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

-// 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 '../serve/utils.dart';
-
 const GROUP = """
 import 'package:barback/barback.dart';
 
 import 'transformer.dart';
 
 class RewriteGroup implements TransformerGroup {
   RewriteGroup.asPlugin();
 
   Iterable<Iterable> get phases => [[new RewriteTransformer.asPlugin()]];
 }
 """;
-
 main() {
   initConfig();
   withBarbackVersions("any", () {
     integration("runs a transformer group", () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
           "transformers": ["myapp/src/group"]
         }),
-        d.dir("lib", [d.dir("src", [
-          d.file("transformer.dart", REWRITE_TRANSFORMER),
-          d.file("group.dart", GROUP)
-        ])]),
-        d.dir("web", [
-          d.file("foo.txt", "foo")
-        ])
-      ]).create();
-
+            d.dir(
+                "lib",
+                [
+                    d.dir(
+                        "src",
+                        [
+                            d.file("transformer.dart", REWRITE_TRANSFORMER),
+                            d.file("group.dart", GROUP)])]),
+            d.dir("web", [d.file("foo.txt", "foo")])]).create();
       createLockFile('myapp', pkg: ['barback']);
-
       pubServe();
       requestShouldSucceed("foo.out", "foo.out");
       endPubServe();
     });
   });
 }