Issue 2264 - Remove deprecated logic from Utils.runAsync() on Firefox

lib/elemHideHitRegistration.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 90 matching lines @@
   securityInfo: null,
   notificationCallbacks: null,
   loadFlags: 0,
   loadGroup: null,
   name: null,
   status: Cr.NS_OK,
 
   asyncOpen: function(listener, context)
   {
     let stream = this.open();
-    Utils.runAsync(function()
+    Utils.runAsync(() =>
     {
       try {
         listener.onStartRequest(this, context);
       } catch(e) {}
       try {
         listener.onDataAvailable(this, context, stream, 0, stream.available());
       } catch(e) {}
       try {
         listener.onStopRequest(this, context, Cr.NS_OK);
       } catch(e) {}
-    }, this);
+    });
   },
 
   open: function()
   {
     let {Policy} = require("contentPolicy");
     let {ElemHide} = require("elemHide");
 
     // This dummy binding below won't have any effect on the element. For
     // elements that should be hidden however we don't return any binding at
     // all, this makes Gecko stop constructing the node - it cannot be shown.
@@ skipping 22 matching lines @@
   {
     throw Cr.NS_ERROR_NOT_IMPLEMENTED;
   },
   resume: function()
   {
     throw Cr.NS_ERROR_NOT_IMPLEMENTED;
   },
 
   QueryInterface: XPCOMUtils.generateQI([Ci.nsIChannel, Ci.nsIRequest])
 };