Migrate block 163 to Dart 2.0.

tests/language/unresolved_top_level_var_negative_test.dart

Index: tests/language/unresolved_top_level_var_negative_test.dart
diff --git a/tests/language/unresolved_top_level_var_negative_test.dart b/tests/language/unresolved_top_level_var_negative_test.dart
deleted file mode 100644
index 589ddd5e6c1ddabf5de17631a9c54849d83a78b1..0000000000000000000000000000000000000000
--- a/tests/language/unresolved_top_level_var_negative_test.dart
+++ /dev/null
@@ -1,12 +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.
-
-// Test that an unresolved identifier at the top level does not crash
-// the parser.
-
-var a = b;
-
-main() {
-  print(a);
-}