Fixed #27489 -- Renamed permissions upon model renaming in migrations.

tests/auth_tests/operations_migrations/0001_initial.py

@@ -0,0 +1,14 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+    initial = True
+
+    operations = [
+        migrations.CreateModel(
+            name="OldModel",
+            fields=[
+                ("id", models.AutoField(primary_key=True)),
+            ],
+        ),
+    ]