Fixed #17890 -- Added an extra_context parameter to AdminSite.password_change().

tests/templates/custom_admin/password_change_form.html

@@ -1,6 +1,7 @@
 {% extends "registration/password_change_form.html" %}
 
 {% block content %}
+{{ spam }}
 Hello from a custom password change form template
 {{ block.super }}
 {% endblock %}