onOwnerChangedFromGroup method
Implementation
@protected
void onOwnerChangedFromGroup(
    String groupId, String newOwner, String oldOwner) {
  for (var observer in List<ChatUIKitObserverBase>.of(observers)) {
    if (observer is GroupObserver) {
      observer.onOwnerChangedFromGroup(groupId, newOwner, oldOwner);
    }
  }
}