remove(item, customFindingComparator) {
    super.remove(item, customFindingComparator);
    this.priorities.delete(item);
    return this;
  }
Remove item from priority queue.
@param {*} item - item we're going to remove.
@param {Comparator} [customFindingComparator] - custom function for finding the item to remove
@return {PriorityQueue}