Revert "Implement override checks."

tests/language/bad_override_test.dart

Index: tests/language/bad_override_test.dart
diff --git a/tests/language/bad_override_test.dart b/tests/language/bad_override_test.dart
deleted file mode 100644
index 55955cead4a0278bfad62fae79664e0a317ab752..0000000000000000000000000000000000000000
--- a/tests/language/bad_override_test.dart
+++ /dev/null
@@ -1,28 +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.
-
-class Fisk {
-  get fisk() => null;
-  static /// 01: compile-time error
-  set fisk(x) {}
-  static /// 02: compile-time error
-  get hest() => null;
-  set hest(x) {}
-  foo() {}
-  var field;
-  method() {}
-  nullary() {}
-}
-
-class Hest extends Fisk {
-  static foo() {} /// 03: compile-time error
-  field() {} /// 04: compile-time error
-  var method; /// 05: compile-time error
-  nullary(x) {} /// 06: compile-time error
-}
-
-main() {
-  new Fisk();
-  new Hest();
-}