eZ\Publish\Core\FieldType\Url\UrlStorage\Gateway::unlinkUrl PHP Method

    public abstract function unlinkUrl($fieldId, $versionNo);

 /**
  * Removes link to URL for $fieldId in $versionNo and cleans up possibly orphaned URLs.
  *
  * @param int|string $fieldId
  * @param int $versionNo
  */
 public function unlinkUrl($fieldId, $versionNo)
 {
     $this->urlGateway->unlinkUrl($fieldId, $versionNo);
 }