Issue 3225 - Make sure Policy.shouldAllow can be overwritten by Diagnostics extension

lib/contentPolicy.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 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 53 matching lines @@
 
   /**
    * Called on module startup, initializes various exported properties.
    */
   init: function()
   {
     // whitelisted URL schemes
     for (let scheme of Prefs.whitelistschemes.toLowerCase().split(" "))
       this.whitelistSchemes.add(scheme);
 
-    Utils.addChildMessageListener("AdblockPlus:ShouldAllow", this.shouldAllow.bind(this));
+    Utils.addChildMessageListener("AdblockPlus:ShouldAllow", message => this.shouldAllow(message));
 
     // Generate class identifier used to collapse nodes and register
     // corresponding stylesheet.
     let collapsedClass = "";
     let offset = "a".charCodeAt(0);
     for (let i = 0; i < 20; i++)
       collapsedClass +=  String.fromCharCode(offset + Math.random() * 26);
     Utils.addChildMessageListener("AdblockPlus:GetCollapsedClass", () => collapsedClass);
 
     let collapseStyle = Services.io.newURI("data:text/css," +
@@ skipping 310 matching lines @@
   {
     // EffectiveTLDService throws on IP addresses, just compare the host name
     let host = "";
     try
     {
       host = uri.host;
     } catch (e) {}
     return host != docDomain;
   }
 }