[gnome-shell] messageTray: Remove an unused instance variable

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

commit b39f56e81396d6d62911681e5610627de99764d3
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Sun Nov 25 20:32:54 2012 -0500

    messageTray: Remove an unused instance variable

 js/ui/messageTray.js |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/messageTray.js b/js/ui/messageTray.js
index 6fba5dd..6b7199e 100644
--- a/js/ui/messageTray.js
+++ b/js/ui/messageTray.js
@@ -1441,7 +1441,6 @@ const MessageTray = new Lang.Class({
         this._clickedSummaryItem = null;
         this._clickedSummaryItemMouseButton = -1;
         this._clickedSummaryItemAllocationChangedId = 0;
-        this._pointerBarrier = 0;
 
         this._closeButton = makeCloseButton();
         this._closeButton.hide();