Remove the certificate management methods from dart:io

tests/standalone/io/delete_a_directory_later.dart

Index: tests/standalone/io/delete_a_directory_later.dart
diff --git a/tests/standalone/io/delete_a_directory_later.dart b/tests/standalone/io/delete_a_directory_later.dart
deleted file mode 100644
index 5e6da0d4f1201b0e1ba517b497f7b0cc59581b85..0000000000000000000000000000000000000000
--- a/tests/standalone/io/delete_a_directory_later.dart
+++ /dev/null
@@ -1,12 +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.
-
-import "dart:io";
-import "dart:async";
-
-main() {
-  new Timer(new Duration(seconds: 2), () {
-    new Directory(new Options().arguments[0]).delete(recursive: true);
-  });
-}