Move VM specific test to the correct location.

tests/language/reflect_core_vm_test.dart

Index: tests/language/reflect_core_vm_test.dart
===================================================================
--- tests/language/reflect_core_vm_test.dart	(revision 26625)
+++ tests/language/reflect_core_vm_test.dart	(working copy)
@@ -1,20 +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.
-
-// Test reflection of private functions in core classes.
-
-import "package:expect/expect.dart";
-import "dart:mirrors";
-
-main() {
-  var s = "string";
-  var im = reflect(s);
-  try {
-    im.invoke(const Symbol("_setAt"), [0, 65]);
-    Expect.isTrue(false);  // Unreachable.
-  } catch (e) {
-    Expect.equals(true, e is NoSuchMethodError);
-  }
-}
-