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

sdk/lib/_internal/pub_generated/test/transformer/prints_a_transform_error_in_apply_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';
-
 final transformer = """
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 
 class RewriteTransformer extends Transformer {
   RewriteTransformer.asPlugin();
 
   String get allowedExtensions => '.txt';
 
   Future apply(Transform transform) => throw new Exception('oh no!');
 }
 """;
-
 main() {
   initConfig();
   withBarbackVersions("any", () {
     integration("prints a transform error in apply", () {
-      d.dir(appPath, [
-        d.pubspec({
+      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();
-
+            d.dir("lib", [d.dir("src", [d.file("transformer.dart", transformer)])]),
+            d.dir("web", [d.file("foo.txt", "foo")])]).create();
       createLockFile('myapp', pkg: ['barback']);
-
       var server = pubServe();
-      server.stderr.expect(emitsLines(
-          'Build error:\n'
-          'Transform Rewrite on myapp|web/foo.txt threw error: oh no!'));
+      server.stderr.expect(
+          emitsLines(
+              'Build error:\n' 'Transform Rewrite on myapp|web/foo.txt threw error: oh no!'));
       endPubServe();
     });
   });
 }