Use native async/await support in pub.

sdk/lib/_internal/pub_generated/test/global/activate/path_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 'package:path/path.dart' as p;
-
-import '../../../lib/src/io.dart';
-import '../../descriptor.dart' as d;
-import '../../test_pub.dart';
-
-main() {
-  initConfig();
-  integration('activates a package at a local path', () {
-    d.dir(
-        "foo",
-        [
-            d.libPubspec("foo", "1.0.0"),
-            d.dir("bin", [d.file("foo.dart", "main() => print('ok');")])]).create();
-
-    var path = canonicalize(p.join(sandboxDir, "foo"));
-    schedulePub(
-        args: ["global", "activate", "--source", "path", "../foo"],
-        output: 'Activated foo 1.0.0 at path "$path".');
-  });
-}