Issue 6447 - Switch to Harmony modules in lib/*

lib/synchronizer.js

Index: lib/synchronizer.js
===================================================================
--- a/lib/synchronizer.js
+++ b/lib/synchronizer.js
@@ -16,44 +16,42 @@
  */
 
 "use strict";
 
 /**
  * @fileOverview Manages synchronization of filter subscriptions.
  */
 
-const {Downloader, Downloadable,
-       MILLIS_IN_SECOND, MILLIS_IN_MINUTE,
-       MILLIS_IN_HOUR, MILLIS_IN_DAY} = require("./downloader");
-const {Filter} = require("./filterClasses");
-const {FilterStorage} = require("./filterStorage");
-const {FilterNotifier} = require("./filterNotifier");
-const {Prefs} = require("prefs");
-const {Subscription,
-       DownloadableSubscription} = require("./subscriptionClasses");
-const {Utils} = require("utils");
+import {Downloader, Downloadable,
+        MILLIS_IN_SECOND, MILLIS_IN_MINUTE,
+        MILLIS_IN_HOUR, MILLIS_IN_DAY} from "./downloader";
+import {Filter} from "./filterClasses";
+import {FilterStorage} from "./filterStorage";
+import {FilterNotifier} from "./filterNotifier";
+import {Prefs} from "prefs";
+import {Subscription, DownloadableSubscription} from "./subscriptionClasses";
+import {Utils} from "utils";
 
 const INITIAL_DELAY = 1 * MILLIS_IN_MINUTE;
 const CHECK_INTERVAL = 1 * MILLIS_IN_HOUR;
 const DEFAULT_EXPIRATION_INTERVAL = 5 * MILLIS_IN_DAY;
 
 /**
  * The object providing actual downloading functionality.
  * @type {Downloader}
  */
 let downloader = null;
 
 /**
  * This object is responsible for downloading filter subscriptions whenever
  * necessary.
  * @class
  */
-let Synchronizer = exports.Synchronizer =
-{
+export let Synchronizer = {
   /**
    * Called on module startup.
    */
   init()
   {
     downloader = new Downloader(this._getDownloadables.bind(this),
                                 INITIAL_DELAY, CHECK_INTERVAL);
     onShutdown.add(() =>