code: void removeTiles(String tilePath, Point southwest, Point northeast, OnOfflineTilesRemovedCallback callback) {
      new RemoveTilesTask(navigator, tilePath, southwest, northeast, callback).execute();
    }
docs: Removes tiles within / intersected by a bounding box
  
  @param tilePath  directory path where the tiles are located
  @param southwest lower left {@link Point} of the bounding box
  @param northeast upper right {@link Point} of the bounding box
  @param callback  a callback that will be fired when the routing tiles have been removed completely