code: public final void notifyContentItemRemoved(int position) {
          if (position < 0 || position >= contentItemCount) {
              throw new IndexOutOfBoundsException("The given position " + position
                      + " is not within the position bounds for content items [0 - "
                      + (contentItemCount - 1) + "].");
          }
          notifyItemRemoved(position + headerItemCount);
      }
docs: Notifies that a content item is removed.
  
  @param position the position.