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

sdk/lib/_internal/pub_generated/test/global/activate/installs_dependencies_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:scheduled_test/scheduled_test.dart';
 
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration('activating a package installs its dependencies', () {
     servePackages((builder) {
-      builder.serve("foo", "1.0.0", deps: {"bar": "any"});
-      builder.serve("bar", "1.0.0", deps: {"baz": "any"});
+      builder.serve("foo", "1.0.0", deps: {
+        "bar": "any"
+      });
+      builder.serve("bar", "1.0.0", deps: {
+        "baz": "any"
+      });
       builder.serve("baz", "1.0.0");
     });
 
-    schedulePub(args: ["global", "activate", "foo"], output: allOf([
-      contains("Downloading bar 1.0.0..."),
-      contains("Downloading baz 1.0.0...")
-    ]));
+    schedulePub(
+        args: ["global", "activate", "foo"],
+        output: allOf(
+            [contains("Downloading bar 1.0.0..."), contains("Downloading baz 1.0.0...")]));
   });
 }