Use XMLHttpRequest constructor in JS modules

lib/ui.js

 /*
  * This file is part of Adblock Plus <http://adblockplus.org/>,
  * Copyright (C) 2006-2013 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 142 matching lines @@
           this.value = UI.isToolbarIconVisible(window);
         };
         addCommandHandler("adblockplus-showinaddonbar", handler);
         addCommandHandler("adblockplus-showintoolbar", handler);
       }
 
       let list = doc.getElementById("adblockplus-subscription-list");
       if (list)
       {
         // Load subscriptions data
-        let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest);
+        let request = new XMLHttpRequest();
         request.mozBackgroundRequest = true;
         request.open("GET", "chrome://adblockplus/content/ui/subscriptions.xml");
         request.addEventListener("load", function()
         {
           if (onShutdown.done)
             return;
 
           let currentSubscription = FilterStorage.subscriptions.filter(
             function(subscription) subscription instanceof DownloadableSubscription && subscription.url != Prefs.subscriptions_exceptionsurl
           );
@@ skipping 103 matching lines @@
    * Gets called on startup, initializes UI integration.
    */
   init: function()
   {
     // We should call initDone once both overlay and filters are loaded
     let overlayLoaded = false;
     let filtersLoaded = false;
     let sessionRestored = false;
 
     // Start loading overlay
-    let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIJSXMLHttpRequest);
+    let request = new XMLHttpRequest();
     request.mozBackgroundRequest = true;
     request.open("GET", "chrome://adblockplus/content/ui/overlay.xul");
     request.addEventListener("load", function(event)
     {
       if (onShutdown.done)
         return;
 
       this.processOverlay(request.responseXML.documentElement);
 
       overlayLoaded = true;
@@ skipping 489 matching lines @@
           </dialog>';
         Services.ww.openWindow(window,
                                "data:application/vnd.mozilla.xul+xml," + encodeURIComponent(dialogSource),
                                "_blank", "chrome,centerscreen,resizable,dialog=no", null);
       }
     }
 
     if (addSubscription)
     {
       // Load subscriptions data
-      let request = Cc["@mozilla.org/xmlextras/xmlhttprequest;1"].createInstance(Ci.nsIXMLHttpRequest);
+      let request = new XMLHttpRequest();
       request.mozBackgroundRequest = true;
       request.open("GET", "chrome://adblockplus/content/ui/subscriptions.xml");
       request.addEventListener("load", function()
       {
         if (onShutdown.done)
           return;
 
         let node = Utils.chooseFilterSubscription(request.responseXML.getElementsByTagName("subscription"));
         let subscription = (node ? Subscription.fromURL(node.getAttribute("url")) : null);
         if (subscription)
@@ skipping 1217 matching lines @@
   ["abp-command-contribute", "command", UI.openContributePage.bind(UI)],
   ["abp-command-contribute-hide", "command", UI.hideContributeButton.bind(UI)]
 ];
 
 onShutdown.add(function()
 {
   for (let window in UI.applicationWindows)
     if (UI.isBottombarOpen(window))
       UI.toggleBottombar(window);
 });