Issue 656 - Replace some __proto__ with Object.create

lib/subscriptionClasses.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2014 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 136 matching lines @@
     let buffer = [];
     this.serialize(buffer);
     return buffer.join("\n");
   }
 };
 
 /**
  * Cache for known filter subscriptions, maps URL to subscription objects.
  * @type Object
  */
-Subscription.knownSubscriptions = {__proto__: null};
+Subscription.knownSubscriptions = Object.create(null);
 
 /**
  * Returns a subscription from its URL, creates a new one if necessary.
  * @param {String} url  URL of the subscription
  * @return {Subscription} subscription or null if the subscription couldn't be created
  */
 Subscription.fromURL = function(url)
 {
   if (url in Subscription.knownSubscriptions)
     return Subscription.knownSubscriptions[url];
@@ skipping 410 matching lines @@
     if (this.softExpiration)
       buffer.push("softExpiration=" + this.softExpiration);
     if (this.errors)
       buffer.push("errors=" + this.errors);
     if (this.version)
       buffer.push("version=" + this.version);
     if (this.requiredVersion)
       buffer.push("requiredVersion=" + this.requiredVersion);
   }
 };