Remove jshint - move everything over to eslint

Also removed all hints of previous linters

js/chromium.js

@@ -1,10 +1,14 @@
+/* global extension: false */
+
+// eslint-disable-next-line func-names
 (function() {
   'use strict';
+
   // Browser specific functions for Chrom*
   window.extension = window.extension || {};
 
   extension.windows = {
-    onClosed: function(callback) {
+    onClosed(callback) {
       window.addEventListener('beforeunload', callback);
     },
   };