Remove support for MediaWiki <= 1.39

With release of MediaWiki 1.41 we no longer need to support MW 1.39

Bug: T355105
Change-Id: I7957ca8aefee168ef11bc20905abd9944faecd73

resources/js/ext.uls.common.js

@@ -63,7 +63,7 @@
 		// Track if event logging is enabled
 		mw.hook( 'mw.uls.interface.language.change' ).fire( language );
 
-		if ( !mw.uls.isNamed() ) {
+		if ( !mw.user.isNamed() ) {
 			return changeLanguageAnon();
 		}
 
@@ -238,14 +238,4 @@
 
 		return ret;
 	};
-
-	/**
-	 * Determine if a user is named. Wrapper method is needed since mw.user.isNamed() was added in MW 1.40
-	 * For MW < 1.40
-	 * @returns {boolean}
-	 */
-	mw.uls.isNamed = function () {
-		return typeof mw.user.isNamed === 'function' ? mw.user.isNamed() : !mw.user.isAnon();
-	};
-
 }() );