Migrate language block 46 - canonical_const ... char_escape.

tests/language_strong/cha_deopt3_deferred_lib.dart

Index: tests/language_strong/cha_deopt3_deferred_lib.dart
diff --git a/tests/language_strong/cha_deopt3_deferred_lib.dart b/tests/language_strong/cha_deopt3_deferred_lib.dart
deleted file mode 100644
index 31ad3d2fdbf4a64ded55b2e75041b1d998f2e691..0000000000000000000000000000000000000000
--- a/tests/language_strong/cha_deopt3_deferred_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.
-
-import "cha_deopt3_lib.dart";
-
-class U implements T {}
-
-make_u() => new U();