Revert "Add some failing (in Dart2Js) tests."

tests/language/src/Operator4Test.dart

Index: tests/language/src/Operator4Test.dart
diff --git a/tests/language/src/Operator4Test.dart b/tests/language/src/Operator4Test.dart
deleted file mode 100644
index 642fef90673a5bf33308cee7ba30adc73a65c975..0000000000000000000000000000000000000000
--- a/tests/language/src/Operator4Test.dart
+++ /dev/null
@@ -1,21 +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.
-
-class A {
-  operator <(other) => 1;
-}
-
-// This triggered a bug in Dart2Js: relational operators were not correctly
-// boolified.
-foo(a) {
-  if (a < a) {
-    return "bad";
-  } else {
-    return 499;
-  }
-}
-
-main() {
-  Expect.equals(499, foo(new A()));
-}