Added back helper file accidentally deleted during test block 219 migration.

tests/lib_strong/mirrors/deferred_type_other.dart

Index: tests/lib_strong/mirrors/deferred_type_other.dart
diff --git a/tests/lib_strong/mirrors/deferred_type_other.dart b/tests/lib_strong/mirrors/deferred_type_other.dart
deleted file mode 100644
index 58e7417e9d921899609b45af7c8cf8de75587abe..0000000000000000000000000000000000000000
--- a/tests/lib_strong/mirrors/deferred_type_other.dart
+++ /dev/null
@@ -1,7 +0,0 @@
-// Copyright (c) 2015, 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 deferred_type_other;
-
-class DeferredType {}