[gnome-shell] layout: Remove stray reference to parentSetId

[Colin Walters <walters src gnome org>]

commit 32110a9866fda2e8b6ca255b42d44fedb5ffb132
Author: Colin Walters <walters verbum org>
Date:   Wed Feb 12 14:13:08 2014 -0500

    layout: Remove stray reference to parentSetId
    
    This was removed in a4dea25d761d2f85f9c940f6673cefa8ab198156.

 js/ui/layout.js |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/layout.js b/js/ui/layout.js
index 6f7bceb..82d848a 100644
--- a/js/ui/layout.js
+++ b/js/ui/layout.js
@@ -853,7 +853,6 @@ const LayoutManager = new Lang.Class({
         this._trackedActors.splice(i, 1);
         actor.disconnect(actorData.visibleId);
         actor.disconnect(actorData.allocationId);
-        actor.disconnect(actorData.parentSetId);
         actor.disconnect(actorData.destroyId);
 
         this._queueUpdateRegions();