Move isolate tests to lib/isolate.

tests/language/deferred_in_isolate_lib.dart

Index: tests/language/deferred_in_isolate_lib.dart
diff --git a/tests/language/deferred_in_isolate_lib.dart b/tests/language/deferred_in_isolate_lib.dart
deleted file mode 100644
index 30c66a5a7452b9d5dac7b5895e5c2b85dbf0e71d..0000000000000000000000000000000000000000
--- a/tests/language/deferred_in_isolate_lib.dart
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright (c) 2014, 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_in_isolate_lib;
-
-class DeferredObj {
-  DeferredObj(this._val);
-  toString() => "$_val";
-    
-  var _val;
-}