Remove compile-time error for unresolved factory names (issue 3079).

tests/language/factory5_test.dart

Index: tests/language/factory5_test.dart
===================================================================
--- tests/language/factory5_test.dart	(revision 0)
+++ tests/language/factory5_test.dart	(revision 0)
@@ -0,0 +1,16 @@
+// Copyright (c) 2012, 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.
+
+interface Link<T> default LinkFactory {
+  Link.create();
+}
+
+class LinkFactory<T> {
+  factory Link.create() { return null; }
+  factory Foo.create() { return null; }  /// 00: static type warning
+}
+
+main() {
+  var a = new Link<int>.create();
+}