Issue 6447 - Switch to Harmony modules in lib/*

lib/filterStorage.js

Index: lib/filterStorage.js
===================================================================
--- a/lib/filterStorage.js
+++ b/lib/filterStorage.js
@@ -17,36 +17,35 @@
 
 "use strict";
 
 /**
  * @fileOverview FilterStorage class responsible for managing user's
  *               subscriptions and filters.
  */
 
-const {IO} = require("io");
-const {Prefs} = require("prefs");
-const {Filter, ActiveFilter} = require("./filterClasses");
-const {Subscription, SpecialSubscription,
-       ExternalSubscription} = require("./subscriptionClasses");
-const {FilterNotifier} = require("./filterNotifier");
+import {IO} from "io";
+import {Prefs} from "prefs";
+import {Filter, ActiveFilter} from "./filterClasses";
+import {Subscription, SpecialSubscription,
+        ExternalSubscription} from "./subscriptionClasses";
+import {FilterNotifier} from "./filterNotifier";
 
 /**
  * Version number of the filter storage file format.
  * @type {number}
  */
 let formatVersion = 5;
 
 /**
  * This class reads user's filters from disk, manages them in memory
  * and writes them back.
  * @class
  */
-let FilterStorage = exports.FilterStorage =
-{
+export let FilterStorage = {
   /**
    * Will be set to true after the initial loadFromDisk() call completes.
    * @type {boolean}
    */
   initialized: false,
 
   /**
    * Version number of the patterns.ini format used.