public synchronized LottieTask<T> removeListener(LottieListener<T> listener) {
    successListeners.remove(listener);
    return this;
  }
Remove a given task listener. The task will continue to execute so you can re-add
a listener if necessary.

@return the task for call chaining.
lottie/src/main/java/com/airbnb/lottie/LottieTask.java