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

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

Index: sdk/lib/_internal/pub_generated/test/serve/does_not_serve_dart_in_release_test.dart
diff --git a/sdk/lib/_internal/pub/test/serve/does_not_serve_dart_in_release_test.dart b/sdk/lib/_internal/pub_generated/test/serve/does_not_serve_dart_in_release_test.dart
similarity index 62%
copy from sdk/lib/_internal/pub/test/serve/does_not_serve_dart_in_release_test.dart
copy to sdk/lib/_internal/pub_generated/test/serve/does_not_serve_dart_in_release_test.dart
index 1c61497267518f8246dc81f4fd2770f669c87fff..45418cff0574d3ffe9d5497af5e0fc467ac53e9a 100644
--- a/sdk/lib/_internal/pub/test/serve/does_not_serve_dart_in_release_test.dart
+++ b/sdk/lib/_internal/pub_generated/test/serve/does_not_serve_dart_in_release_test.dart
@@ -12,35 +12,24 @@ main() {
   initConfig();
   integration("does not serve .dart files in release mode", () {
 
-    d.dir("foo", [
-      d.libPubspec("foo", "0.0.1"),
-      d.dir("lib", [
-        d.file("foo.dart",
-            """
+    d.dir(
+        "foo",
+        [d.libPubspec("foo", "0.0.1"), d.dir("lib", [d.file("foo.dart", """
             library foo;
             foo() => 'foo';
-            """)
-      ])
-    ]).create();
+            """)])]).create();
 
-    d.dir(appPath, [
-      d.appPubspec({
-        "foo": {"path": "../foo"}
+    d.dir(appPath, [d.appPubspec({
+        "foo": {
+          "path": "../foo"
+        }
       }),
-      d.dir("lib", [
-        d.file("lib.dart", "lib() => print('hello');"),
-      ]),
-      d.dir("web", [
-        d.file("file.dart",
-            """
+          d.dir("lib", [d.file("lib.dart", "lib() => print('hello');"),]),
+          d.dir("web", [d.file("file.dart", """
             import 'package:foo/foo.dart';
             main() => print('hello');
             """),
-        d.dir("sub", [
-          d.file("sub.dart", "main() => 'foo';"),
-        ])
-      ])
-    ]).create();
+            d.dir("sub", [d.file("sub.dart", "main() => 'foo';"),])])]).create();
 
     pubServe(shouldGetFirst: true, args: ["--mode", "release"]);
     requestShould404("file.dart");