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

sdk/lib/_internal/pub_generated/test/cache/repair/handles_failure_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 '../../../lib/src/exit_codes.dart' as exit_codes;
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration('handles failure to reinstall some packages', () {
     // Only serve two packages so repairing will have a failure.
     servePackages((builder) {
       builder.serve("foo", "1.2.3");
       builder.serve("foo", "1.2.5");
     });
 
     // Set up a cache with some packages.
-    d.dir(cachePath, [
-      d.dir('hosted', [
-        d.async(port.then((p) => d.dir('localhost%58$p', [
-          d.dir("foo-1.2.3", [
-            d.libPubspec("foo", "1.2.3"),
-            d.file("broken.txt")
-          ]),
-          d.dir("foo-1.2.4", [
-            d.libPubspec("foo", "1.2.4"),
-            d.file("broken.txt")
-          ]),
-          d.dir("foo-1.2.5", [
-            d.libPubspec("foo", "1.2.5"),
-            d.file("broken.txt")
-          ])
-        ])))
-      ])
-    ]).create();
+    d.dir(
+        cachePath,
+        [
+            d.dir(
+                'hosted',
+                [
+                    d.async(
+                        port.then(
+                            (p) =>
+                                d.dir(
+                                    'localhost%58$p',
+                                    [
+                                        d.dir("foo-1.2.3", [d.libPubspec("foo", "1.2.3"), d.file("broken.txt")]),
+                                        d.dir("foo-1.2.4", [d.libPubspec("foo", "1.2.4"), d.file("broken.txt")]),
+                                        d.dir(
+                                            "foo-1.2.5",
+                                            [d.libPubspec("foo", "1.2.5"), d.file("broken.txt")])])))])]).create();
 
     // Repair them.
     var pub = startPub(args: ["cache", "repair"]);
 
     pub.stdout.expect("Downloading foo 1.2.3...");
     pub.stdout.expect("Downloading foo 1.2.4...");
     pub.stdout.expect("Downloading foo 1.2.5...");
 
     pub.stderr.expect(startsWith("Failed to repair foo 1.2.4. Error:"));
     pub.stderr.expect("HTTP error 404: Not Found");
 
     pub.stdout.expect("Reinstalled 2 packages.");
     pub.stdout.expect("Failed to reinstall 1 package.");
 
     pub.shouldExit(exit_codes.UNAVAILABLE);
   });
 }