Revert "Revert "Use native async/await support in pub.""

sdk/lib/_internal/pub_generated/test/global/run/reflects_changes_to_local_package_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.
-
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('changes in a path package are immediately reflected', () {
-    d.dir(
-        "foo",
-        [
-            d.libPubspec("foo", "1.0.0"),
-            d.dir("bin", [d.file("foo.dart", "main() => print('ok');")])]).create();
-
-    schedulePub(args: ["global", "activate", "--source", "path", "../foo"]);
-
-    d.file("foo/bin/foo.dart", "main() => print('changed');").create();
-
-    var pub = pubRun(global: true, args: ["foo"]);
-    pub.stdout.expect("changed");
-    pub.shouldExit();
-  });
-}