Implement revised factories in the VM.

tests/language/src/Factory2Test.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.
 // Dart test program for testing factories.
 
-interface Link<T> extends Iterable<T> factory LinkFactory {
+interface Link<T> extends Iterable<T> factory LinkFactory<T> {
   Link(T head, [Link<T> tail]);
   Link<T> prepend(T element);
 }
 
 interface EmptyLink<T> extends Link<T> factory LinkTail<T> {
   const EmptyLink();
 }
 
-class LinkFactory {
-  factory Link<T>(head, [Link tail]) {
+class LinkFactory<T> {
+  factory Link(head, [Link tail]) {
   }
 }
 
 class AbstractLink<T> implements Link<T> {
   const AbstractLink();
   Link<T> prepend(T element) {
     return new Link<T>(element, this);
   }
 }
 
 class LinkTail<T> extends AbstractLink<T> implements EmptyLink<T> {
   const LinkTail();
 }
 
 class LinkEntry<T> extends AbstractLink<T> {
   LinkEntry(T head, Link<T> realTail);
 }
 
 class Fisk {
  Link<String> nodes = const EmptyLink();
 }
 
 main() {
   new Fisk();
   new EmptyLink<String>().prepend('hest');
   const EmptyLink<String>().prepend('fisk');
 }