Migrate block 163 to Dart 2.0.

tests/language_strong/unicode_bom_test.dart

Index: tests/language_strong/unicode_bom_test.dart
diff --git a/tests/language_strong/unicode_bom_test.dart b/tests/language_strong/unicode_bom_test.dart
deleted file mode 100644
index 2e234458d9a812adf5b88680a98f767bb7efccbd..0000000000000000000000000000000000000000
--- a/tests/language_strong/unicode_bom_test.dart
+++ /dev/null
@@ -1,11 +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.
-
-// This file is saved with a BOM character (as first character). This character
-// should be ignored.
-// Tests that files with a BOM character are correctly handled.
-
-main() {
-  /* do nothing. */
-}