Migrate the language tests up to arithmetic_test.

tests/language/argument_definition_test.dart

Index: tests/language/argument_definition_test.dart
diff --git a/tests/language/argument_definition_test.dart b/tests/language/argument_definition_test.dart
deleted file mode 100644
index e16b7526582036102bb0c0ba8a1bf017e6537e13..0000000000000000000000000000000000000000
--- a/tests/language/argument_definition_test.dart
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) 2012, 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.
-// Dart test program for testing that the argument definition test has been
-// removed.
-
-import "package:expect/expect.dart";
-
-int test(a, {b, c}) {
-  if (?b) return b; // //# 01: compile-time error
-  return a + b + c;
-}
-
-main() {
-  Expect.equals(6, test(1, b: 2, c: 3));
-}