Remove ULSMobileWebfontsEnabled

To my knowledge never used since it was added in in 2013 with
commit fd885d9881.

Bug: T332837
Change-Id: Ia9ecb3e4dd47b8ce4dfaaa489a1ec5a71c378492

resources/js/ext.uls.webfonts.mobile.js

@@ -1,51 +0,0 @@
-/*!
- * MobileFrontend compatible ULS-Webfonts integration
- *
- * Copyright (C) 2013 Alolita Sharma, Amir Aharoni, Arun Ganesh, Brandon Harris,
- * Niklas Laxström, Pau Giner, Ryan Kaldari, Santhosh Thottingal, Siebrand Mazeland
- * and other contributors. See CREDITS for a list.
- *
- * UniversalLanguageSelector is dual licensed GPLv2 or later and MIT. You don't
- * have to do anything special to choose one license or the other and you don't
- * have to notify anyone which license you are using. You are free to use
- * UniversalLanguageSelector in commercial projects as long as the copyright
- * header is left intact. See files GPL-LICENSE and MIT-LICENSE for details.
- *
- * @file
- * @ingroup Extensions
- * @licence GNU General Public Licence 2.0 or later
- * @licence MIT License
- */
-
-( function () {
-	'use strict';
-
-	var mediawikiFontRepository;
-
-	mw.webfonts = mw.webfonts || {};
-
-	mediawikiFontRepository = $.webfonts.repository;
-	mediawikiFontRepository.base = mw.config.get( 'wgExtensionAssetsPath' ) +
-		'/UniversalLanguageSelector/data/fontrepo/fonts/';
-
-	$( function () {
-		// MediaWiki specific overrides for jquery.webfonts
-		$.extend( $.fn.webfonts.defaults, {
-			repository: mediawikiFontRepository,
-			fontStack: $( document.body ).css( 'font-family' ).split( /, /g ),
-			fontSelector: function ( repository, language ) {
-				var font = repository.defaultFont( language );
-
-				if ( font === 'system' ) {
-					// Avoid setting 'system' as a font in css
-					font = null;
-				}
-
-				return font;
-			}
-		} );
-
-		$( document.body ).webfonts();
-	} );
-
-}() );