[gnome-shell] layout: Remove an unused variable

[Jasper St. Pierre <jstpierre src gnome org>]

commit 7798da8dff8ceece12bdba0e9b8d24aa6229bb2d
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Fri Jan 11 16:20:26 2013 -0500

    layout: Remove an unused variable
    
    The tray barrier was removed when the hot corner to activate the message
    tray was removed.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=677215

 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 6791eba..4bc41c6 100644
--- a/js/ui/layout.js
+++ b/js/ui/layout.js
@@ -114,7 +114,6 @@ const LayoutManager = new Lang.Class({
         this._background = null;
         this._leftPanelBarrier = 0;
         this._rightPanelBarrier = 0;
-        this._trayBarrier = 0;
 
         this._inOverview = false;
         this._updateRegionIdle = 0;