use utils.debounce instead

lib/persona.js

@@ -10,9 +10,7 @@ $(document).ready(function() {
 	setupQuickReply();
 	configureNavbarHiding();
 
-	require(['lodash'], function (_) {
+	$(window).on('resize', utils.debounce(configureNavbarHiding, 200));
-		$(window).on('resize', _.debounce(configureNavbarHiding, 200));
-	});
 
 	function configureNavbarHiding () {
 		var navbarEl = $(".navbar-fixed-top");
@@ -25,7 +23,7 @@ $(document).ready(function() {
 				showOnBottom: false,
 			});
 		}
-	};
+	}
 
 	function setupNProgress() {
 		$(window).on('action:ajaxify.start', function() {