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

sdk/lib/_internal/pub_generated/test/serve/supports_user_defined_declaring_transformers_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS d.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 '../descriptor.dart' as d;
 import '../test_pub.dart';
 import 'utils.dart';
 
@@ skipping 20 matching lines @@
     transform.declareOutput(transform.primaryId.changeExtension(".final"));
     return new Future.value();
   }
 }
 """;
 
 main() {
   initConfig();
   withBarbackVersions("any", () {
     integration("supports a user-defined declaring transformer", () {
-      d.dir(appPath, [
-        d.pubspec({
+      d.dir(appPath, [d.pubspec({
           "name": "myapp",
           "transformers": ["myapp/src/lazy", "myapp/src/declaring"]
         }),
-        d.dir("lib", [d.dir("src", [
-          // Include a lazy transformer before the declaring transformer,
-          // because otherwise its behavior is indistinguishable from a normal
-          // transformer.
-          d.file("lazy.dart", LAZY_TRANSFORMER),
-          d.file("declaring.dart", DECLARING_TRANSFORMER)
-        ])]),
-        d.dir("web", [
-          d.file("foo.txt", "foo")
-        ])
-      ]).create();
+            d.dir(
+                "lib",
+                [d.dir("src", [// Include a lazy transformer before the declaring transformer,
+            // because otherwise its behavior is indistinguishable from a normal
+            // transformer.
+            d.file("lazy.dart", LAZY_TRANSFORMER),
+                d.file("declaring.dart", DECLARING_TRANSFORMER)])]),
+                d.dir("web", [d.file("foo.txt", "foo")])]).create();
 
       createLockFile('myapp', pkg: ['barback']);
 
       var server = pubServe();
       // The build should complete without either transformer logging anything.
       server.stdout.expect('Build completed successfully');
 
       requestShouldSucceed("foo.final", "foo.out.final");
-      server.stdout.expect(emitsLines(
-          '[Info from LazyRewrite]:\n'
-          'Rewriting myapp|web/foo.txt.\n'
-          '[Info from DeclaringRewrite]:\n'
-          'Rewriting myapp|web/foo.out.'));
+      server.stdout.expect(
+          emitsLines(
+              '[Info from LazyRewrite]:\n' 'Rewriting myapp|web/foo.txt.\n'
+                  '[Info from DeclaringRewrite]:\n' 'Rewriting myapp|web/foo.out.'));
       endPubServe();
     });
   });
 }