Issue 3108 - Less hacky approach to disabling E10S compatibility shims

lib/child/elemHide.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 66 matching lines @@
   classID: Components.ID("{55fb7be0-1dd2-11b2-98e6-9e97caf8ba67}"),
   classDescription: "Element hiding hit registration protocol handler",
   aboutPrefix: "abp-elemhidehit",
 
   /**
    * Registers handler on startup.
    */
   init: function()
   {
     let registrar = Components.manager.QueryInterface(Ci.nsIComponentRegistrar);
-    registrar.registerFactory(this.classID, this.classDescription,
+    let registerFactory = Utils.getPropertyWithoutCompatShims(registrar, "registerFactory");
+    registerFactory.call(registrar, this.classID, this.classDescription,
         "@mozilla.org/network/protocol/about;1?what=" + this.aboutPrefix, this);
     onShutdown.add(function()
     {
       registrar.unregisterFactory(this.classID, this);
     }.bind(this));
   },
 
   //
   // Factory implementation
   //
@@ skipping 107 matching lines @@
   {
     throw Cr.NS_ERROR_NOT_IMPLEMENTED;
   },
   resume: function()
   {
     throw Cr.NS_ERROR_NOT_IMPLEMENTED;
   },
 
   QueryInterface: XPCOMUtils.generateQI([Ci.nsIChannel, Ci.nsIRequest])
 };