in src/main/java/org/apache/sling/jcr/jackrabbit/base/security/MultiplexingAuthorizableAction.java [86:91]
public void onRemove(Authorizable authorizable, Session session) throws RepositoryException {
log.debug("Removed authorizable {}", authorizable.getID());
for(AuthorizableAction a : getActions()){
a.onRemove(authorizable,session);
}
}