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

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

Index: sdk/lib/_internal/pub_generated/test/upgrade/report/shows_newer_available_versions_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/upgrade/report/shows_newer_available_versions_test.dart b/sdk/lib/_internal/pub_generated/test/upgrade/report/shows_newer_available_versions_test.dart
deleted file mode 100644
index 99364476537ca6b6876d4d14f1924f4c9ea9cc3c..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/test/upgrade/report/shows_newer_available_versions_test.dart
+++ /dev/null
@@ -1,52 +0,0 @@
-// 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 many newer versions are available", () {
-    servePackages((builder) {
-      builder.serve("multiple_newer", "1.0.0");
-      builder.serve("multiple_newer", "1.0.1-unstable.1");
-      builder.serve("multiple_newer", "1.0.1");
-      builder.serve("multiple_newer", "1.0.2-unstable.1");
-      builder.serve("multiple_newer_stable", "1.0.0");
-      builder.serve("multiple_newer_stable", "1.0.1");
-      builder.serve("multiple_newer_stable", "1.0.2");
-      builder.serve("multiple_newer_unstable", "1.0.0");
-      builder.serve("multiple_newer_unstable", "1.0.1-unstable.1");
-      builder.serve("multiple_newer_unstable", "1.0.1-unstable.2");
-      builder.serve("no_newer", "1.0.0");
-      builder.serve("one_newer_unstable", "1.0.0");
-      builder.serve("one_newer_unstable", "1.0.1-unstable.1");
-      builder.serve("one_newer_stable", "1.0.0");
-      builder.serve("one_newer_stable", "1.0.1");
-    });
-
-    // Constraint everything to the first version.
-    d.appDir({
-      "multiple_newer": "1.0.0",
-      "multiple_newer_stable": "1.0.0",
-      "multiple_newer_unstable": "1.0.0",
-      "no_newer": "1.0.0",
-      "one_newer_unstable": "1.0.0",
-      "one_newer_stable": "1.0.0"
-    }).create();
-
-    // Upgrade everything.
-    pubUpgrade(output: new RegExp(r"""
-Resolving dependencies\.\.\..*
-. multiple_newer 1\.0\.0 \(1\.0\.1 available\)
-. multiple_newer_stable 1\.0\.0 \(1\.0\.2\ available\)
-. multiple_newer_unstable 1\.0\.0 \(1\.0\.1-unstable\.2 available\)
-. no_newer 1\.0\.0
-. one_newer_stable 1\.0\.0 \(1\.0\.1 available\)
-. one_newer_unstable 1\.0\.0 \(1\.0\.1-unstable\.1 available\)
-""", multiLine: true));
-  });
-}