Don't hard-code class names when calling static methods
|Reported by:||Owned by:||nobody|
|Cc:||Triage Stage:||Ready for checkin|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
UserManager.normalize_email should be called on the instance, not the class. This has the same effect normally but is more helpful to subclassers. When methods are called directly on the class, subclasses can't override them.
Pull request: https://github.com/django/django/pull/1232