Issue 6447 - Switch to Harmony modules in lib/*

lib/elemHide.js

Index: lib/elemHide.js
===================================================================
--- a/lib/elemHide.js
+++ b/lib/elemHide.js
@@ -16,18 +16,18 @@
  */
 
 "use strict";
 
 /**
  * @fileOverview Element hiding implementation.
  */
 
-const {ElemHideException} = require("./filterClasses");
-const {FilterNotifier} = require("./filterNotifier");
+import {ElemHideException} from "./filterClasses";
+import {FilterNotifier} from "./filterNotifier";
 
 /**
  * Lookup table, filters by their associated key
  * @type {Object}
  */
 let filterByKey = [];
 
 /**
@@ -79,17 +79,17 @@
  * @type {Object}
  */
 let exceptions = Object.create(null);
 
 /**
  * Container for element hiding filters
  * @class
  */
-let ElemHide = exports.ElemHide = {
+export let ElemHide = {
   /**
    * Removes all known filters
    */
   clear()
   {
     filterByKey = [];
     keyByFilter = new Map();
     filtersByDomain = new Map();