Migrate block 163 to Dart 2.0.

tests/language_strong/unicode_hash_test.dart

Index: tests/language_strong/unicode_hash_test.dart
diff --git a/tests/language_strong/unicode_hash_test.dart b/tests/language_strong/unicode_hash_test.dart
deleted file mode 100644
index 430c51ef16c4dd6a43ef1d8a63ccb32d83b930d3..0000000000000000000000000000000000000000
--- a/tests/language_strong/unicode_hash_test.dart
+++ /dev/null
@@ -1,10 +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.
-
-import "package:expect/expect.dart";
-
-main() {
-  Expect.equals("\u{10412}", "𐐒"); // Second string is literal U+10412.
-  Expect.equals("\u{10412}".hashCode, "𐐒".hashCode);
-}