Revert "Support runtime check of function types."

tests/language/function_subtype_typearg4_test.dart

Index: tests/language/function_subtype_typearg4_test.dart
diff --git a/tests/language/function_subtype_typearg4_test.dart b/tests/language/function_subtype_typearg4_test.dart
deleted file mode 100644
index 6d95de58e2fcb160ca870e0081233870ea946ec6..0000000000000000000000000000000000000000
--- a/tests/language/function_subtype_typearg4_test.dart
+++ /dev/null
@@ -1,20 +0,0 @@
-// Copyright (c) 2013, 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.
-// Dart test program for constructors and initializers.
-
-// Check function subtyping of type arguments.
-
-import 'package:expect/expect.dart';
-
-class C<T> {}
-
-class I {}
-class J extends I {}
-
-typedef I f1();
-typedef J f2();
-
-main() {
-  Expect.isTrue(new C<f1>() is C<f2>);
-}