Extract OrderedTypeSetBuilderBase from OrderedTypeSetBuilder

tests/compiler/dart2js/serialization/test_helper.dart

Index: tests/compiler/dart2js/serialization/test_helper.dart
diff --git a/tests/compiler/dart2js/serialization/test_helper.dart b/tests/compiler/dart2js/serialization/test_helper.dart
index 4d7bafbbfe91492998974274f021d73aa6f8ff65..fb25b31c8d143b04436992fd34ec7fe1db31fa77 100644
--- a/tests/compiler/dart2js/serialization/test_helper.dart
+++ b/tests/compiler/dart2js/serialization/test_helper.dart
@@ -287,7 +287,7 @@ bool checkTypes(Object object1, Object object2, String property,
 ///
 /// Uses [object1], [object2] and [property] to provide context for failures.
 bool checkTypeLists(Object object1, Object object2, String property,
-    List<ResolutionDartType> list1, List<ResolutionDartType> list2) {
+    List<DartType> list1, List<DartType> list2) {
   return checkListEquivalence(
       object1, object2, property, list1, list2, checkTypes);
 }