removeReplyListener(replyListenerId) {
    const index = this._replyListeners.findIndex((replyListener) => {
      return replyListener.id === replyListenerId;
    });
    if (index === -1) {
      return null;
    }
    return this._replyListeners.splice(index, 1)[0];
  }
Removes a reply that has been prev. registered for a message response.
@param {Number} replyListenerId The ID of the reply listener.
@return {Object} deletedListener The removed reply listener if
  found. This object has `id`, `chatId`, `messageId` and `callback`
  properties. If not found, returns `null`.