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

sdk/lib/_internal/pub_generated/test/global/run/uses_old_lockfile_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 '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration('uses the 1.6-style lockfile if necessary', () {
     servePackages((builder) {
       builder.serve("bar", "1.0.0");
-      builder.serve("foo", "1.0.0", deps: {"bar": "any"}, contents: [
-        d.dir("bin", [
-          d.file("script.dart", """
+      builder.serve("foo", "1.0.0", deps: {
+        "bar": "any"
+      }, contents: [d.dir("bin", [d.file("script.dart", """
               import 'package:bar/bar.dart' as bar;
 
-              main(args) => print(bar.main());""")
-        ])
-      ]);
+              main(args) => print(bar.main());""")])]);
     });
 
     schedulePub(args: ["cache", "add", "foo"]);
     schedulePub(args: ["cache", "add", "bar"]);
 
-    d.dir(cachePath, [
-      d.dir('global_packages', [
-        d.file('foo.lock', '''
+    d.dir(cachePath, [d.dir('global_packages', [d.file('foo.lock', '''
 packages:
   foo:
     description: foo
     source: hosted
     version: "1.0.0"
   bar:
     description: bar
     source: hosted
-    version: "1.0.0"''')
-      ])
-    ]).create();
+    version: "1.0.0"''')])]).create();
 
     var pub = pubRun(global: true, args: ["foo:script"]);
     pub.stdout.expect("bar 1.0.0");
     pub.shouldExit();
 
-    d.dir(cachePath, [
-      d.dir('global_packages', [
-        d.nothing('foo.lock'),
-        d.dir('foo', [d.matcherFile('pubspec.lock', contains('1.0.0'))])
-      ])
-    ]).validate();
+    d.dir(
+        cachePath,
+        [
+            d.dir(
+                'global_packages',
+                [
+                    d.nothing('foo.lock'),
+                    d.dir('foo', [d.matcherFile('pubspec.lock', contains('1.0.0'))])])]).validate();
   });
 }