Update more test for assignment to final variables

tests/language/static_final_field2_negative_test.dart

Index: tests/language/static_final_field2_negative_test.dart
diff --git a/tests/language/static_final_field2_negative_test.dart b/tests/language/static_final_field2_negative_test.dart
deleted file mode 100644
index aef1cefbbe99b273364c4a6300fa80e8e049794a..0000000000000000000000000000000000000000
--- a/tests/language/static_final_field2_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.
-// Disallow re-assignment of a final static variable.
-
-class A {
-  static const x = 1;
-}
-
-main() {
-  A.x = 2;  // <- reassignment not allowed.
-}