Issue 4795 - Use modern JavaScript syntax

lib/filterComposer.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 /** @module filterComposer */
 
 "use strict";
 
-let {defaultMatcher} = require("matcher");
-let {RegExpFilter} = require("filterClasses");
-let {FilterNotifier} = require("filterNotifier");
-let {Prefs} = require("prefs");
-let {extractHostFromFrame, stringifyURL, isThirdParty} = require("url");
-let {getKey, checkWhitelisted} = require("whitelisting");
-let {port} = require("messaging");
+const {defaultMatcher} = require("matcher");
+const {RegExpFilter} = require("filterClasses");
+const {FilterNotifier} = require("filterNotifier");
+const {Prefs} = require("prefs");
+const {extractHostFromFrame, stringifyURL, isThirdParty} = require("url");
+const {getKey, checkWhitelisted} = require("whitelisting");
+const {port} = require("messaging");
 
 let readyPages = new ext.PageMap();
 
 /**
  * Checks whether the given page is ready to use the filter composer
  *
  * @param {Page} page
  * @return {boolean}
  */
 exports.isPageReady = page =>
@@ skipping 195 matching lines @@
     baseURL: message.baseURL,
     page:    sender.page,
     frame:   sender.frame
   });
 });
 
 ext.pages.onLoading.addListener(page =>
 {
   page.sendMessage({type: "composer.content.finished"});
 });