Refs #18012 -- Removed the now unused proxied_children model option.

Thanks to Tim for the review.

django/db/models/base.py

@@ -185,7 +185,6 @@ class ModelBase(type):
                 raise TypeError("Proxy model '%s' has no non-abstract model base class." % name)
             new_class._meta.setup_proxy(base)
             new_class._meta.concrete_model = base._meta.concrete_model
-            base._meta.concrete_model._meta.proxied_children.append(new_class._meta)
         else:
             new_class._meta.concrete_model = new_class
 

django/db/models/options.py

@@ -71,7 +71,6 @@ class Options(object):
 
     def __init__(self, meta, app_label=None):
         self._get_fields_cache = {}
-        self.proxied_children = []
         self.local_fields = []
         self.local_many_to_many = []
         self.virtual_fields = []