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

sdk/lib/_internal/pub_generated/test/get/git/require_pubspec_test.dart

Index: sdk/lib/_internal/pub_generated/test/get/git/require_pubspec_test.dart
diff --git a/sdk/lib/_internal/pub_generated/test/get/git/require_pubspec_test.dart b/sdk/lib/_internal/pub_generated/test/get/git/require_pubspec_test.dart
deleted file mode 100644
index a81e3761a8059090e41a6dce81852b3706d93512..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/test/get/git/require_pubspec_test.dart
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright (c) 2012, 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('requires the dependency to have a pubspec', () {
-    ensureGit();
-
-    d.git('foo.git', [d.libDir('foo')]).create();
-
-    d.appDir({
-      "foo": {
-        "git": "../foo.git"
-      }
-    }).create();
-
-    pubGet(
-        error: new RegExp(
-            r'Could not find a file named "pubspec\.yaml" ' r'in "[^\n]*"\.'));
-  });
-}