Migrating a block of dart 1 tests to dart 2

tests/language/class_override_test.dart

Index: tests/language/class_override_test.dart
diff --git a/tests/language/class_override_test.dart b/tests/language/class_override_test.dart
deleted file mode 100644
index 011e64a72ad4ae03151c648bc788882def5c8f0d..0000000000000000000000000000000000000000
--- a/tests/language/class_override_test.dart
+++ /dev/null
@@ -1,23 +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 warning if a method m1 overrides a method m2 and has a
-// different number of required parameters.
-
-class A {
-  foo() {}
-}
-
-class B extends A {
-  foo(a) {} // //# 00: static type warning
-}
-
-main() {
-  B instance = new B();
-  try {
-    instance.foo();
-  } on NoSuchMethodError catch (error) { // //# 00: continued
-  } finally {}
-  print("Success");
-}