Remove ClassHierarchy factory constructor.

pkg/kernel/test/typecheck.dart

Index: pkg/kernel/test/typecheck.dart
diff --git a/pkg/kernel/test/typecheck.dart b/pkg/kernel/test/typecheck.dart
index a02815ab0519cb73f43b92176ab2e417e35239a0..e5efb88b3d432a950d48c262cc5723fd7f439db9 100644
--- a/pkg/kernel/test/typecheck.dart
+++ b/pkg/kernel/test/typecheck.dart
@@ -4,6 +4,7 @@
 import 'package:kernel/kernel.dart';
 import 'package:kernel/class_hierarchy.dart';
 import 'package:kernel/core_types.dart';
+import 'package:kernel/src/incremental_class_hierarchy.dart';
 import 'package:kernel/type_checker.dart';
 import 'dart:io';
 
@@ -20,7 +21,7 @@ main(List<String> args) {
   }
   var program = loadProgramFromBinary(args[0]);
   var coreTypes = new CoreTypes(program);
-  var hierarchy = new ClassHierarchy(program);
+  var hierarchy = new IncrementalClassHierarchy();
   new TestTypeChecker(coreTypes, hierarchy).checkProgram(program);
 }