code: public void removeExtension() {
  
  		deleteRelationships();
  
  		geoPackage.deleteTable(StyleTable.TABLE_NAME);
  
  		geoPackage.deleteTable(IconTable.TABLE_NAME);
  
  		try {
  			if (extensionsDao.isTableExists()) {
  				extensionsDao.deleteByExtension(EXTENSION_NAME);
  			}
  		} catch (SQLException e) {
  			throw new GeoPackageException(
  					"Failed to delete Feature Style extension. GeoPackage: "
  							+ geoPackage.getName(), e);
  		}
  
  	}
docs: Completely remove and delete the extension and all styles and icons