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

sdk/lib/_internal/pub_generated/test/run/mode_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 '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 const TRANSFORMER = """
 import 'dart:async';
 
@@ skipping 11 matching lines @@
         new AssetId(transform.primaryInput.id.package, "bin/script.dart"),
         "void main() => print('\${_settings.mode.name}');"));
   }
 }
 """;
 
 main() {
   initConfig();
   withBarbackVersions("any", () {
     integration('runs a local script with customizable modes', () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
           "transformers": ["myapp/src/transformer"]
         }),
-        d.dir("lib", [d.dir("src", [
-          d.file("transformer.dart", TRANSFORMER),
-          d.file("primary.in", "")
-        ])])
-      ]).create();
+            d.dir(
+                "lib",
+                [
+                    d.dir(
+                        "src",
+                        [
+                            d.file("transformer.dart", TRANSFORMER),
+                            d.file("primary.in", "")])])]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
       // By default it should run in debug mode.
       var pub = pubRun(args: ["script"]);
       pub.stdout.expect("debug");
       pub.shouldExit();
 
       // A custom mode should be specifiable.
       pub = pubRun(args: ["--mode", "custom-mode", "script"]);
       pub.stdout.expect("custom-mode");
       pub.shouldExit();
     });
 
     integration('runs a dependency script with customizable modes', () {
-      d.dir("foo", [
-        d.pubspec({
+      d.dir("foo", [d.pubspec({
           "name": "foo",
           "version": "1.2.3",
           "transformers": ["foo/src/transformer"]
         }),
-        d.dir("lib", [d.dir("src", [
-          d.file("transformer.dart", TRANSFORMER),
-          d.file("primary.in", "")
-        ])])
-      ]).create();
+            d.dir(
+                "lib",
+                [
+                    d.dir(
+                        "src",
+                        [
+                            d.file("transformer.dart", TRANSFORMER),
+                            d.file("primary.in", "")])])]).create();
 
-      d.appDir({"foo": {"path": "../foo"}}).create();
+      d.appDir({
+        "foo": {
+          "path": "../foo"
+        }
+      }).create();
 
       createLockFile('myapp', sandbox: ['foo'], pkg: ['barback']);
 
       // By default it should run in release mode.
       var pub = pubRun(args: ["foo:script"]);
       pub.stdout.expect("release");
       pub.shouldExit();
 
       // A custom mode should be specifiable.
       pub = pubRun(args: ["--mode", "custom-mode", "foo:script"]);
       pub.stdout.expect("custom-mode");
       pub.shouldExit();
     });
   });
 }