Use ::class for class name resolution

Available since php5.5

Change-Id: Ie71b7f9d289a34532f6e3e1f32ac25bf08b9903f

UniversalLanguageSelector.hooks.php

@@ -69,7 +69,7 @@ class UniversalLanguageSelectorHooks {
 		if ( $wgULSCompactLanguageLinksBetaFeature === true &&
 			$wgInterwikiMagic === true &&
 			$wgHideInterlanguageLinks === false &&
-			class_exists( 'BetaFeatures' ) &&
+			class_exists( BetaFeatures::class ) &&
 			BetaFeatures::isFeatureEnabled( $user, 'uls-compact-links' )
 		) {
 			// Compact language links is a beta feature in this wiki. Check the user's

data/LanguageNameIndexer.php

@@ -156,5 +156,5 @@ PHP;
 	}
 }
 
-$maintClass = 'LanguageNameIndexer';
+$maintClass = LanguageNameIndexer::class;
 require_once RUN_MAINTENANCE_IF_MAIN;

maintenance/ULSCompactLinksDisablePref.php

@@ -117,5 +117,5 @@ class ULSCompactLinksDisablePref extends Maintenance {
 	}
 }
 
-$maintClass = "ULSCompactLinksDisablePref";
+$maintClass = ULSCompactLinksDisablePref::class;
 require_once RUN_MAINTENANCE_IF_MAIN;