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

sdk/lib/_internal/pub_generated/test/run/errors_if_only_transitive_dependency_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 '../../lib/src/exit_codes.dart' as exit_codes;
 import '../descriptor.dart' as d;
 import '../test_pub.dart';
 
 main() {
   initConfig();
   integration('Errors if the script is in a non-immediate dependency.', () {
-    d.dir("foo", [
-      d.libPubspec("foo", "1.0.0"),
-      d.dir("bin", [
-        d.file("bar.dart", "main() => print('foobar');")
-      ])
-    ]).create();
+    d.dir(
+        "foo",
+        [
+            d.libPubspec("foo", "1.0.0"),
+            d.dir("bin", [d.file("bar.dart", "main() => print('foobar');")])]).create();
 
-    d.dir("bar", [
-      d.libPubspec("bar", "1.0.0", deps: {
-        "foo": {"path": "../foo"}
-      })
-    ]).create();
+    d.dir("bar", [d.libPubspec("bar", "1.0.0", deps: {
+        "foo": {
+          "path": "../foo"
+        }
+      })]).create();
 
-    d.dir(appPath, [
-      d.appPubspec({
-        "bar": {"path": "../bar"}
-      })
-    ]).create();
+    d.dir(appPath, [d.appPubspec({
+        "bar": {
+          "path": "../bar"
+        }
+      })]).create();
 
     pubGet();
 
     var pub = pubRun(args: ["foo:script"]);
     pub.stderr.expect('Package "foo" is not an immediate dependency.');
     pub.stderr.expect('Cannot run executables in transitive dependencies.');
     pub.shouldExit(exit_codes.DATA);
   });
 }