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

sdk/lib/_internal/pub_generated/test/serve/gets_first_if_source_changed_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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 'dart:convert';
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
 main() {
   initConfig();
-  integration("gets first if a dependency's source doesn't match the one in "
-      "the lock file", () {
-    d.dir("foo", [
-      d.libPubspec("foo", "0.0.1"),
-      d.libDir("foo")
-    ]).create();
+  integration(
+      "gets first if a dependency's source doesn't match the one in " "the lock file",
+      () {
+    d.dir("foo", [d.libPubspec("foo", "0.0.1"), d.libDir("foo")]).create();
 
-    d.dir(appPath, [
-      // A pubspec with a path source.
+    d.dir(appPath, [// A pubspec with a path source.
       d.appPubspec({
-        "foo": {"path": "../foo"}
-      }),
-      // A lock file with the hosted source.
+        "foo": {
+          "path": "../foo"
+        }
+      }), // A lock file with the hosted source.
       d.file("pubspec.lock", JSON.encode({
         'packages': {
           'foo': {
             'version': '0.0.0',
             'source': 'hosted',
             'description': 'foo'
           }
         }
-      }))
-    ]).create();
+      }))]).create();
 
     pubServe(shouldGetFirst: true);
     requestShouldSucceed("packages/foo/foo.dart", 'main() => "foo";');
     endPubServe();
   });
 }