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

sdk/lib/_internal/pub_generated/test/get/hosted/get_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 '../../../lib/src/exit_codes.dart' as exit_codes;
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration('gets a package from a pub server', () {
     servePackages((builder) => builder.serve("foo", "1.2.3"));
 
-    d.appDir({"foo": "1.2.3"}).create();
+    d.appDir({
+      "foo": "1.2.3"
+    }).create();
 
     pubGet();
 
-    d.cacheDir({"foo": "1.2.3"}).validate();
-    d.packagesDir({"foo": "1.2.3"}).validate();
+    d.cacheDir({
+      "foo": "1.2.3"
+    }).validate();
+    d.packagesDir({
+      "foo": "1.2.3"
+    }).validate();
   });
 
   integration('URL encodes the package name', () {
     serveNoPackages();
 
-    d.appDir({"bad name!": "1.2.3"}).create();
+    d.appDir({
+      "bad name!": "1.2.3"
+    }).create();
 
     pubGet(
         error: new RegExp(
-          r"Could not find package bad name! at http://localhost:\d+\."),
+            r"Could not find package bad name! at http://localhost:\d+\."),
         exitCode: exit_codes.UNAVAILABLE);
   });
 }