removed unused method
removed unused method

grengojbo/grappelli-admin-tools,glic3rinu/django-admin-tools,glic3rinu/django-admin-tools,glic3rinu/django-admin-tools,artscoop/django-admin-tools,artscoop/django-admin-tools,artscoop/django-admin-tools,grengojbo/grappelli-admin-tools-trunk,grengojbo/grappelli-admin-tools-trunk,glic3rinu/django-admin-tools,artscoop/django-admin-tools,grengojbo/grappelli-admin-tools,grengojbo/grappelli-admin-tools-trunk,grengojbo/grappelli-admin-tools