Migrate language block 46 - canonical_const ... char_escape.

tests/language/cha_deopt1_lib.dart

Index: tests/language/cha_deopt1_lib.dart
diff --git a/tests/language/cha_deopt1_lib.dart b/tests/language/cha_deopt1_lib.dart
deleted file mode 100644
index 72a86f399b821978e457df808b5c85b90756c4e3..0000000000000000000000000000000000000000
--- a/tests/language/cha_deopt1_lib.dart
+++ /dev/null
@@ -1,9 +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 mylib;
-
-class T {
-  m() => 42;
-}