Use 'InitializeClass' alias for 'default__class_init__'.

MailHost.py

@@ -26,7 +26,7 @@
 from AccessControl.Permissions import use_mailhost_services
 from AccessControl.Role import RoleManager
 from Acquisition import Implicit
-from App.class_init import default__class_init__ as InitializeClass
+from App.class_init import InitializeClass
 from App.special_dtml import DTMLFile
 from DateTime.DateTime import DateTime
 from Persistence import Persistent