Revert "Support runtime check of function types."

tests/language/function_subtype_factory0_test.dart

Index: tests/language/function_subtype_factory0_test.dart
diff --git a/tests/language/function_subtype_factory0_test.dart b/tests/language/function_subtype_factory0_test.dart
deleted file mode 100644
index 91d6056e00570415d682629724009a027b523191..0000000000000000000000000000000000000000
--- a/tests/language/function_subtype_factory0_test.dart
+++ /dev/null
@@ -1,27 +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 with type variables in factory constructors.
-
-import 'package:expect/expect.dart';
-
-typedef void Foo<T>(T t);
-
-class C<T> {
-  factory C(foo) {
-    if (foo is Foo<T>) {
-      return new C.internal();
-    }
-    return null;
-  }
-  C.internal();
-}
-
-void method(String s) {}
-
-void main() {
-  Expect.isNotNull(new C<String>(method));
-  Expect.isNull(new C<bool>(method));
-}