Move frog/tests/{leg,leg_only,frog_native} to tests/compiler/.

frog/tests/leg_only/simple_string_constant_test.dart

Index: frog/tests/leg_only/simple_string_constant_test.dart
===================================================================
--- frog/tests/leg_only/simple_string_constant_test.dart	(revision 8644)
+++ frog/tests/leg_only/simple_string_constant_test.dart	(working copy)
@@ -1,9 +0,0 @@
-// Copyright (c) 2011, 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.
-
-final String m = "\u{21}";
-
-main() {
-  Expect.equals('!', m);
-}