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

sdk/lib/_internal/pub_generated/test/get/path/absolute_symlink_test.dart

 // Copyright (c) 2013, 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 d.file.
 
 import 'package:path/path.dart' as path;
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
-  integration("generates a symlink with an absolute path if the dependency "
-              "path was absolute", () {
-    d.dir("foo", [
-      d.libDir("foo"),
-      d.libPubspec("foo", "0.0.1")
-    ]).create();
+  integration(
+      "generates a symlink with an absolute path if the dependency "
+          "path was absolute",
+      () {
+    d.dir("foo", [d.libDir("foo"), d.libPubspec("foo", "0.0.1")]).create();
 
-    d.dir(appPath, [
-      d.appPubspec({
-        "foo": {"path": path.join(sandboxDir, "foo")}
-      })
-    ]).create();
+    d.dir(appPath, [d.appPubspec({
+        "foo": {
+          "path": path.join(sandboxDir, "foo")
+        }
+      })]).create();
 
     pubGet();
 
     d.dir("moved").create();
 
     // Move the app but not the package. Since the symlink is absolute, it
     // should still be able to find it.
     scheduleRename(appPath, path.join("moved", appPath));
 
-    d.dir("moved", [
-      d.dir(packagesPath, [
-        d.dir("foo", [
-          d.file("foo.dart", 'main() => "foo";')
-        ])
-      ])
-    ]).validate();
+    d.dir(
+        "moved",
+        [
+            d.dir(
+                packagesPath,
+                [d.dir("foo", [d.file("foo.dart", 'main() => "foo";')])])]).validate();
   });
-}
+}