Issue 3873 - Replace object literals using __proto__ with Object.create(null)

test/subscriptionClasses.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 14 matching lines @@
 function compareSubscription(test, url, expected, postInit)
 {
   expected.push("[Subscription]")
   let subscription = Subscription.fromURL(url);
   if (postInit)
     postInit(subscription)
   let result = [];
   subscription.serialize(result);
   test.equal(result.sort().join("\n"), expected.sort().join("\n"), url);
 
-  let map = {__proto__: null};
+  let map = Object.create(null);
   for (let line of result.slice(1))
   {
     if (/(.*?)=(.*)/.test(line))
       map[RegExp.$1] = RegExp.$2;
   }
   let subscription2 = Subscription.fromObject(map);
   test.equal(subscription.toString(), subscription2.toString(), url + " deserialization");
 }
 
 exports.testSubscriptionClassDefinitions = function(test)
@@ skipping 32 matching lines @@
     subscription.requiredVersion = "0.6";
   });
   compareSubscription(test, "~wl~", ["url=~wl~", "disabled=true", "title=Test group"], function(subscription)
   {
     subscription.title = "Test group";
     subscription.disabled = true;
   });
 
   test.done();
 };