Issue 3208 - Send Private Browsing flag separately from the frame structure

lib/child/elemHide.js

Index: lib/child/elemHide.js
===================================================================
--- a/lib/child/elemHide.js
+++ b/lib/child/elemHide.js
@@ -30,17 +30,17 @@ try
 catch (e)
 {
   Cu.reportError(e);
 }
 
 let {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});
 
 let {Utils} = require("utils");
-let {getFrames} = require("child/utils");
+let {getFrames, isPrivate} = require("child/utils");
 
 let messageID = 0;
 
 // The allowXBL 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.
 const allowXBL = "<bindings xmlns='http://www.mozilla.org/xbl'><binding id='dummy' bindToUntrustedContent='true'/></bindings>";
 const hideXBL = "<bindings xmlns='http://www.mozilla.org/xbl'/>";
@@ -147,21 +147,23 @@ HitRegistrationChannel.prototype = {
       try {
         listener.onDataAvailable(this, context, stream, 0, stream.available());
       } catch(e) {}
       try {
         listener.onStopRequest(this, context, Cr.NS_OK);
       } catch(e) {}
     };
 
+    let window = Utils.getRequestWindow(this);
     addMessageListener(responseMessage, processResponse);
     sendAsyncMessage("AdblockPlus:ElemHideHit", {
       responseMessage,
       key: this.key,
-      frames: getFrames(Utils.getRequestWindow(this))
+      frames: getFrames(window),
+      isPrivate: isPrivate(window)
     });
   },
 
   asyncOpen2: function(listener)
   {
     if (!this.loadInfo.triggeringPrincipal.equals(Utils.systemPrincipal))
       throw Cr.NS_ERROR_FAILURE;
     this.asyncOpen(listener, null);