public function getTextboxProtectionCSSClasses( Title $title ) {
$classes = []; // Textarea CSS
if ( $title->isProtected( 'edit' ) &&
- MediaWikiServices::getInstance()->getNamespaceInfo()->
- getRestrictionLevels( $title->getNamespace() ) !== [ '' ]
+ MediaWikiServices::getInstance()->getPermissionManager()
+ ->getNamespaceRestrictionLevels( $title->getNamespace() ) !== [ '' ]
) {
# Is the title semi-protected?
if ( $title->isSemiProtected() ) {