Use native async/await support in pub.

sdk/lib/_internal/pub_generated/test/cache/repair/recompiles_snapshots_test.dart

-// 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.
-
-library pub_tests;
-
-import 'package:scheduled_test/scheduled_test.dart';
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('recompiles activated executable snapshots', () {
-    servePackages((builder) {
-      builder.serve(
-          "foo",
-          "1.0.0",
-          contents: [
-              d.dir("bin", [d.file("script.dart", "main(args) => print('ok');")])]);
-    });
-
-    schedulePub(args: ["global", "activate", "foo"]);
-
-    d.dir(
-        cachePath,
-        [
-            d.dir(
-                'global_packages/foo/bin',
-                [d.file('script.dart.snapshot', 'junk')])]).create();
-
-    schedulePub(args: ["cache", "repair"], output: '''
-          Downloading foo 1.0.0...
-          Reinstalled 1 package.
-          Reactivating foo 1.0.0...
-          Precompiling executables...
-          Loading source assets...
-          Precompiled foo:script.
-          Reactivated 1 package.''');
-
-    var pub = pubRun(global: true, args: ["foo:script"]);
-    pub.stdout.expect("ok");
-    pub.shouldExit();
-  });
-}