Revert "Migrating a block of dart 2:"

tests/language_2/class_override_test.dart

Index: tests/language_2/class_override_test.dart
diff --git a/tests/language_2/class_override_test.dart b/tests/language_2/class_override_test.dart
deleted file mode 100644
index 41ec7ad5e2d22db765d780c6430b33deada96e29..0000000000000000000000000000000000000000
--- a/tests/language_2/class_override_test.dart
+++ /dev/null
@@ -1,18 +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.
-
-// It is a static compile time error if a method m1 overrides a method m2 and has a
-// different number of required parameters.
-
-class A {
-  foo() {}
-}
-
-class B extends A {
-  /*@compile-error=unspecified*/ foo(a) {} 
-}
-
-main() {
-  new B().foo(42);
-}