Remove old AuthHelpers class.

template/app/controller/AuthHelpers.js

-/**
- * A mixin for Comments controller to help with authentication.
- */
-Ext.define('Docs.controller.AuthHelpers', {
-
-    /**
-     * Performs request to the comments server.
-     *
-     * Works as if calling Ext.Ajax.request or Ext.data.JsonP.request
-     * directly, but prefixes the URL with docs base URL and database
-     * name and adds Session ID.
-     *
-     * @param {String} proxy Should we perform "ajax" or "jsonp" request.
-     * @param {Object} config
-     * @protected
-     */
-    request: function(type, config) {
-        config.url = this.addSid(Docs.baseUrl + '/' + Docs.commentsDb + '/' + Docs.commentsVersion + config.url);
-        if (type === "jsonp") {
-            Ext.data.JsonP.request(config);
-        }
-        else {
-            // Allow doing Cross Origin request.
-            config.cors = true;
-            Ext.Ajax.request(config);
-        }
-    },
-
-    addSid: function(url) {
-        var sid = this.getController('Auth').sid;
-        return url + (url.match(/\?/) ? '&' : '?') + 'sid=' + sid;
-    },
-
-    /**
-     * Returns true if user is logged in.
-     */
-    isLoggedIn: function() {
-        return this.getController('Auth').isLoggedIn();
-    }
-
-});