Use native async/await support in pub.

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

Index: sdk/lib/_internal/pub_generated/test/serve/does_not_get_first_if_locked_version_matches_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/serve/does_not_get_first_if_locked_version_matches_test.dart b/sdk/lib/_internal/pub_generated/test/serve/does_not_get_first_if_locked_version_matches_test.dart
deleted file mode 100644
index 67c8c6489385811e819fa521a48318191224815c..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/test/serve/does_not_get_first_if_locked_version_matches_test.dart
+++ /dev/null
@@ -1,40 +0,0 @@
-// 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 file.
-
-library pub_tests;
-
-import '../descriptor.dart' as d;
-import '../test_pub.dart';
-import 'utils.dart';
-
-main() {
-  initConfig();
-  integration(
-      "does not get if the locked version of a dependency is allowed "
-          "by the pubspec's constraint",
-      () {
-    d.dir("foo", [d.libPubspec("foo", "0.0.1"), d.libDir("foo")]).create();
-
-    // Get "foo" into the lock file.
-    d.dir(appPath, [d.appPubspec({
-        "foo": {
-          "path": "../foo",
-          "version": ">=0.0.1"
-        },
-      })]).create();
-    pubGet();
-
-    // Change the version.
-    d.dir(appPath, [d.appPubspec({
-        "foo": {
-          "path": "../foo",
-          "version": "<2.0.0"
-        },
-      })]).create();
-
-    pubServe(shouldGetFirst: false);
-    requestShouldSucceed("packages/foo/foo.dart", 'main() => "foo";');
-    endPubServe();
-  });
-}