Migrate language block 46 - canonical_const ... char_escape.

tests/language_strong/cha_deopt1_deferred_lib.dart

Index: tests/language_strong/cha_deopt1_deferred_lib.dart
diff --git a/tests/language_strong/cha_deopt1_deferred_lib.dart b/tests/language_strong/cha_deopt1_deferred_lib.dart
deleted file mode 100644
index 7add3ed4012b8445c78018bb4488662a9fd48e0b..0000000000000000000000000000000000000000
--- a/tests/language_strong/cha_deopt1_deferred_lib.dart
+++ /dev/null
@@ -1,11 +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.
-
-import "cha_deopt1_lib.dart";
-
-class U extends T {
-  m() => "good horse";
-}
-
-make_u() => new U();