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

sdk/lib/_internal/pub_generated/test/cache/repair/recompiles_snapshots_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.
 
 library pub_tests;
 
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration('recompiles activated executable snapshots', () {
     servePackages((builder) {
-      builder.serve("foo", "1.0.0", contents: [
-        d.dir("bin", [
-          d.file("script.dart", "main(args) => print('ok');")
-        ])
-      ]);
+      builder.serve(
+          "foo",
+          "1.0.0",
+          contents: [
+              d.dir("bin", [d.file("script.dart", "main(args) => print('ok');")])]);
     });
 
     schedulePub(args: ["global", "activate", "foo"]);
 
-    d.dir(cachePath, [
-      d.dir('global_packages/foo/bin', [
-        d.file('script.dart.snapshot', 'junk')
-      ])
-    ]).create();
+    d.dir(
+        cachePath,
+        [
+            d.dir(
+                'global_packages/foo/bin',
+                [d.file('script.dart.snapshot', 'junk')])]).create();
 
-    schedulePub(args: ["cache", "repair"],
-        output: '''
+    schedulePub(args: ["cache", "repair"], output: '''
           Downloading foo 1.0.0...
           Reinstalled 1 package.
           Reactivating foo 1.0.0...
           Precompiling executables...
           Loading source assets...
           Precompiled foo:script.
           Reactivated 1 package.''');
 
     var pub = pubRun(global: true, args: ["foo:script"]);
     pub.stdout.expect("ok");
     pub.shouldExit();
   });
 }