Re-land beginning Dart 2.0 test migration.

tests/language/abstract_beats_arguments2_test.dart

Index: tests/language/abstract_beats_arguments2_test.dart
diff --git a/tests/language/abstract_beats_arguments2_test.dart b/tests/language/abstract_beats_arguments2_test.dart
deleted file mode 100644
index fcda10da89e7e14c172564e05da25f4b0bb90c4b..0000000000000000000000000000000000000000
--- a/tests/language/abstract_beats_arguments2_test.dart
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright (c) 2017, 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";
-
-abstract //# 01: static type warning
-class Abstract {
-  Abstract(_);
-}
-
-void main() {
-  Expect.throws(() => new Abstract(throw "argument"), (e) => e == "argument");
-}