diff --git a/django/contrib/auth/__init__.py b/django/contrib/auth/__init__.py
index 232a822053..f11f8308e3 100644
--- a/django/contrib/auth/__init__.py
+++ b/django/contrib/auth/__init__.py
@@ -21,19 +21,10 @@ def load_backend(path):
         cls = getattr(mod, attr)
     except AttributeError:
         raise ImproperlyConfigured('Module "%s" does not define a "%s" authentication backend' % (module, attr))
-    if not hasattr(cls, "supports_object_permissions"):
-        warn("Authentication backends without a `supports_object_permissions` attribute are deprecated. Please define it in %s." % cls,
-             DeprecationWarning)
-        cls.supports_object_permissions = False
-
-    if not hasattr(cls, 'supports_anonymous_user'):
-        warn("Authentication backends without a `supports_anonymous_user` attribute are deprecated. Please define it in %s." % cls,
-             DeprecationWarning)
-        cls.supports_anonymous_user = False
 
     if not hasattr(cls, 'supports_inactive_user'):
         warn("Authentication backends without a `supports_inactive_user` attribute are deprecated. Please define it in %s." % cls,
-             PendingDeprecationWarning)
+             DeprecationWarning)
         cls.supports_inactive_user = False
     return cls()
 
diff --git a/django/contrib/auth/models.py b/django/contrib/auth/models.py
index 8a1702ec97..57d4b93e61 100644
--- a/django/contrib/auth/models.py
+++ b/django/contrib/auth/models.py
@@ -386,13 +386,6 @@ class User(models.Model):
                 raise SiteProfileNotAvailable
         return self._profile_cache
 
-    def _get_message_set(self):
-        import warnings
-        warnings.warn('The user messaging API is deprecated. Please update'
-                      ' your code to use the new messages framework.',
-                      category=DeprecationWarning)
-        return self._message_set
-    message_set = property(_get_message_set)
 
 class Message(models.Model):
     """
diff --git a/django/contrib/auth/tests/auth_backends.py b/django/contrib/auth/tests/auth_backends.py
index 256357a95e..63b65ad521 100644
--- a/django/contrib/auth/tests/auth_backends.py
+++ b/django/contrib/auth/tests/auth_backends.py
@@ -171,13 +171,9 @@ class RowlevelBackendTest(TestCase):
         self.user1 = User.objects.create_user('test', 'test@example.com', 'test')
         self.user2 = User.objects.create_user('test2', 'test2@example.com', 'test')
         self.user3 = User.objects.create_user('test3', 'test3@example.com', 'test')
-        self.save_warnings_state()
-        warnings.filterwarnings('ignore', category=DeprecationWarning,
-                                module='django.contrib.auth')
 
     def tearDown(self):
         settings.AUTHENTICATION_BACKENDS = self.curr_auth
-        self.restore_warnings_state()
         # The get_group_permissions test messes with ContentTypes, which will
         # be cached; flush the cache to ensure there are no side effects
         # Refs #14975, #14925