Issue 4795 - Use modern JavaScript syntax

lib/url.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
@@ skipping 10 matching lines @@
 let punycode = require("punycode");
 
 let getDecodedHostname =
 /**
  * Gets the IDN-decoded hostname from a URL object.
  *
  * @param {URL} url
  * @return {string}
  * @static
  */
-exports.getDecodedHostname = function(url)
+exports.getDecodedHostname = url =>
 {
   let hostname = url.hostname;
 
   if (hostname.indexOf("xn--") == -1)
     return hostname;
 
   return punycode.toUnicode(hostname);
 };
 
 /**
  * Gets the IDN-decoded hostname from the URL of a frame.
  * If the URL don't have host information (like "about:blank"
  * and "data:" URLs) it falls back to the parent frame.
  *
  * @param {Frame} frame
  * @return {string}
  */
-exports.extractHostFromFrame = function(frame)
+exports.extractHostFromFrame = frame =>
 {
   for (; frame; frame = frame.parent)
   {
     let hostname = getDecodedHostname(frame.url);
     if (hostname)
       return hostname;
   }
 
   return "";
 };
 
 /**
  * Converts a URL object into a string. For HTTP(S) URLs
  * the hostname gets IDN-decoded and the hash is stripped.
  *
  * @param {URL} url
  * @return {string}
  */
-exports.stringifyURL = function(url)
+exports.stringifyURL = url =>
 {
   let protocol = url.protocol;
   let href = url.href;
 
   if (protocol == "http:" || protocol == "https:")
   {
     let hostname = url.hostname;
     if (hostname.indexOf("xn--") != -1)
       href = href.replace(hostname, punycode.toUnicode(hostname));
 
@@ skipping 16 matching lines @@
   return hostname.indexOf(":") == -1;
 }
 
 /**
  * Checks whether the request's origin is different from the document's origin.
  *
  * @param {URL}    url           The request URL
  * @param {string} documentHost  The IDN-decoded hostname of the document
  * @return {Boolean}
  */
-exports.isThirdParty = function(url, documentHost)
+exports.isThirdParty = (url, documentHost) =>
 {
   let requestHost = getDecodedHostname(url).replace(/\.+$/, "");
   documentHost = documentHost.replace(/\.+$/, "");
 
   if (requestHost == documentHost)
     return false;
 
   if (!isDomain(requestHost) || !isDomain(documentHost))
     return true;
 
   return getDomain(requestHost) != getDomain(documentHost);
 };