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

sdk/lib/_internal/pub_generated/test/get/hosted/avoid_network_requests_test.dart

 // Copyright (c) 2012, 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';
@@ skipping 32 matching lines @@
     pubGet();
 
     d.packagesDir({
       "foo": "1.2.0",
       "bar": "1.2.0"
     }).validate();
 
     // The get should not have done any network requests since the lock file is
     // up to date.
     getRequestedPaths().then((paths) {
-      expect(paths, unorderedEquals([
-        // Bar should be requested because it's new, but not foo.
-        "api/packages/bar",
-        // Should only request the most recent version.
-        "api/packages/bar/versions/1.2.0",
-        // Need to download it.
-        "packages/bar/versions/1.2.0.tar.gz"
-      ]));
+      expect(
+          paths,
+          unorderedEquals([// Bar should be requested because it's new, but not foo.
+        "api/packages/bar", // Should only request the most recent version.
+        "api/packages/bar/versions/1.2.0", // Need to download it.
+        "packages/bar/versions/1.2.0.tar.gz"]));
     });
   });
 }