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

sdk/lib/_internal/pub_generated/test/upgrade/report/shows_newer_available_versions_test.dart

-// Copyright (c) 2013, 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.
-
 library pub_tests;
-
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
-
 main() {
   initConfig();
   integration("shows how many newer versions are available", () {
     servePackages((builder) {
       builder.serve("multiple_newer", "1.0.0");
       builder.serve("multiple_newer", "1.0.1-unstable.1");
       builder.serve("multiple_newer", "1.0.1");
       builder.serve("multiple_newer", "1.0.2-unstable.1");
       builder.serve("multiple_newer_stable", "1.0.0");
       builder.serve("multiple_newer_stable", "1.0.1");
       builder.serve("multiple_newer_stable", "1.0.2");
       builder.serve("multiple_newer_unstable", "1.0.0");
       builder.serve("multiple_newer_unstable", "1.0.1-unstable.1");
       builder.serve("multiple_newer_unstable", "1.0.1-unstable.2");
       builder.serve("no_newer", "1.0.0");
       builder.serve("one_newer_unstable", "1.0.0");
       builder.serve("one_newer_unstable", "1.0.1-unstable.1");
       builder.serve("one_newer_stable", "1.0.0");
       builder.serve("one_newer_stable", "1.0.1");
     });
-
-    // Constraint everything to the first version.
     d.appDir({
       "multiple_newer": "1.0.0",
       "multiple_newer_stable": "1.0.0",
       "multiple_newer_unstable": "1.0.0",
       "no_newer": "1.0.0",
       "one_newer_unstable": "1.0.0",
       "one_newer_stable": "1.0.0"
     }).create();
-
-    // Upgrade everything.
     pubUpgrade(output: new RegExp(r"""
 Resolving dependencies\.\.\..*
 . multiple_newer 1\.0\.0 \(1\.0\.1 available\)
 . multiple_newer_stable 1\.0\.0 \(1\.0\.2\ available\)
 . multiple_newer_unstable 1\.0\.0 \(1\.0\.1-unstable\.2 available\)
 . no_newer 1\.0\.0
 . one_newer_stable 1\.0\.0 \(1\.0\.1 available\)
 . one_newer_unstable 1\.0\.0 \(1\.0\.1-unstable\.1 available\)
 """, multiLine: true));
   });
 }