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

sdk/lib/_internal/pub_generated/test/get/hosted/get_transitive_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 '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration('gets packages transitively from a pub server', () {
     servePackages((builder) {
-      builder.serve("foo", "1.2.3", deps: {"bar": "2.0.4"});
+      builder.serve("foo", "1.2.3", deps: {
+        "bar": "2.0.4"
+      });
       builder.serve("bar", "2.0.3");
       builder.serve("bar", "2.0.4");
       builder.serve("bar", "2.0.5");
     });
 
-    d.appDir({"foo": "1.2.3"}).create();
+    d.appDir({
+      "foo": "1.2.3"
+    }).create();
 
     pubGet();
 
-    d.cacheDir({"foo": "1.2.3", "bar": "2.0.4"}).validate();
-    d.packagesDir({"foo": "1.2.3", "bar": "2.0.4"}).validate();
+    d.cacheDir({
+      "foo": "1.2.3",
+      "bar": "2.0.4"
+    }).validate();
+    d.packagesDir({
+      "foo": "1.2.3",
+      "bar": "2.0.4"
+    }).validate();
   });
 }