Correct and GC unrecognized flags from our tests.

tests/language/function_field_test.dart

 // 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.
-// VMOptions=--fatal-type-errors --enable_type_checks
+// VMOptions=--enable_type_checks
 //
 // Test of calling Function, which is field of some class.
 
 import "package:expect/expect.dart";
 
 class Wrapper {
   Function f;
 }
 
 main() {
   Wrapper w = new Wrapper();
   w.f = () {return 42;};
   Expect.equals(42, w.f());
 }