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

sdk/lib/_internal/pub_generated/test/build/handles_long_paths_test.dart

 // Copyright (c) 2013, 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 'package:path/path.dart' as path;
 
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
@@ skipping 13 matching lines @@
   // data\transform\visual
   //
   // This test ensures that we're normalizing at some point before we throw the
   // path at the OS to choke on.
 
   integration("handles long relative paths", () {
     // Dart2js can take a long time to compile dart code, so we increase the
     // timeout to cope with that.
     currentSchedule.timeout *= 3;
 
-    d.dir("some_long_dependency_name", [
-      d.libPubspec("foo", "0.0.1"),
-      d.dir("lib", [
-        d.file("foo.txt", "foo")
-      ])
-    ]).create();
+    d.dir(
+        "some_long_dependency_name",
+        [
+            d.libPubspec("foo", "0.0.1"),
+            d.dir("lib", [d.file("foo.txt", "foo")])]).create();
 
     // Build a 2,800 character (non-canonicalized) path.
     var longPath = "";
-    for (var i = 0; i < 100; i++)
-    {
+    for (var i = 0; i < 100; i++) {
       longPath = path.join(longPath, "..", "some_long_dependency_name");
     }
 
-    d.dir(appPath, [
-      d.appPubspec({
-        "foo": {"path": longPath}
-      }),
-      d.dir("web", [
-        d.file("index.html", "html"),
-      ])
-    ]).create();
+    d.dir(appPath, [d.appPubspec({
+        "foo": {
+          "path": longPath
+        }
+      }), d.dir("web", [d.file("index.html", "html"),])]).create();
 
-    schedulePub(args: ["build"],
+    schedulePub(
+        args: ["build"],
         output: new RegExp(r'Built 2 files to "build".'));
 
-    d.dir(appPath, [
-      d.dir('build', [
-        d.dir('web', [
-          d.file("index.html", "html"),
-          d.dir('packages', [
-            d.dir('foo', [
-              d.file('foo.txt', 'foo')
-            ])
-          ])
-        ])
-      ])
-    ]).validate();
+    d.dir(
+        appPath,
+        [
+            d.dir(
+                'build',
+                [
+                    d.dir(
+                        'web',
+                        [
+                            d.file("index.html", "html"),
+                            d.dir('packages', [d.dir('foo', [d.file('foo.txt', 'foo')])])])])]).validate();
   });
 }