Migrate block 163 to Dart 2.0.

tests/language/unicode_bom_middle_test.dart

Index: tests/language/unicode_bom_middle_test.dart
diff --git a/tests/language/unicode_bom_middle_test.dart b/tests/language/unicode_bom_middle_test.dart
deleted file mode 100644
index e620b2b0ec98e4115dec1c84fbfcfba3354c41df..0000000000000000000000000000000000000000
--- a/tests/language/unicode_bom_middle_test.dart
+++ /dev/null
@@ -1,17 +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";
-
-int inscrutable(int x) => x == 0 ? 0 : x | inscrutable(x & (x - 1));
-
-foo(x) {
-  if (inscrutable(1999) == 1999) return x;
-  return 499;
-}
-
-main() {
-  Expect.equals(3, "xx".length); // BOM character between the xs.
-  Expect.equals(3, foo("xx").length); // BOM character between the xs.
-}