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

sdk/lib/_internal/pub_generated/test/upgrade/report/describes_change_test.dart

 // Copyright (c) 2013, 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.
 
 library pub_tests;
 
 import '../../descriptor.dart' as d;
 import '../../test_pub.dart';
 
 main() {
   initConfig();
   integration("shows how package changed from previous lockfile", () {
     servePackages((builder) {
       builder.serve("unchanged", "1.0.0");
       builder.serve("version_changed", "1.0.0");
       builder.serve("version_changed", "2.0.0");
       builder.serve("source_changed", "1.0.0");
     });
 
-    d.dir("source_changed", [
-      d.libDir("source_changed"),
-      d.libPubspec("source_changed", "2.0.0")
-    ]).create();
+    d.dir(
+        "source_changed",
+        [d.libDir("source_changed"), d.libPubspec("source_changed", "2.0.0")]).create();
 
-    d.dir("description_changed_1", [
-      d.libDir("description_changed"),
-      d.libPubspec("description_changed", "1.0.0")
-    ]).create();
+    d.dir(
+        "description_changed_1",
+        [
+            d.libDir("description_changed"),
+            d.libPubspec("description_changed", "1.0.0")]).create();
 
-    d.dir("description_changed_2", [
-      d.libDir("description_changed"),
-      d.libPubspec("description_changed", "1.0.0")
-    ]).create();
+    d.dir(
+        "description_changed_2",
+        [
+            d.libDir("description_changed"),
+            d.libPubspec("description_changed", "1.0.0")]).create();
 
     // Create the first lockfile.
     d.appDir({
       "unchanged": "any",
       "version_changed": "1.0.0",
       "source_changed": "any",
-      "description_changed": {"path": "../description_changed_1"}
+      "description_changed": {
+        "path": "../description_changed_1"
+      }
     }).create();
 
     pubGet();
 
     // Change the pubspec.
     d.appDir({
       "unchanged": "any",
       "version_changed": "any",
-      "source_changed": {"path": "../source_changed"},
-      "description_changed": {"path": "../description_changed_2"}
+      "source_changed": {
+        "path": "../source_changed"
+      },
+      "description_changed": {
+        "path": "../description_changed_2"
+      }
     }).create();
 
     // Upgrade everything.
     pubUpgrade(output: new RegExp(r"""
 Resolving dependencies\.\.\..*
 . description_changed 1\.0\.0 from path \.\.[/\\]description_changed_2 \(was 1\.0\.0 from path \.\.[/\\]description_changed_1\)
 . source_changed 2\.0\.0 from path \.\.[/\\]source_changed \(was 1\.0\.0\)
 . unchanged 1\.0\.0
 . version_changed 2\.0\.0 \(was 1\.0\.0\)
 """, multiLine: true));
   });
 }