Migrate block 163 to Dart 2.0.

tests/language_2/unresolved_in_factory_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.
 
-// Test that an unresolved method call in a factory is a resolution
-// error.
+// Test that an unresolved method call in a factory is a compile error.
 
 class A {
   factory A() {
-    foo();
+    foo(); /*@compile-error=unspecified*/
   }
 }
 
 main() {
   new A();
 }