[gnome-shell] messageTray: Remove unused method parameter

[Rui Matos <rtcm src gnome org>]

commit 02428019fa7fc5637d1ac29d97158c07c989e3f6
Author: Rui Matos <tiagomatos gmail com>
Date:   Thu Jun 14 19:46:21 2012 +0200

    messageTray: Remove unused method parameter
    
    The alignment of the arrow tip regarding the source actor is set with
    setSourceAlignment() and its default is already 0.5 .
    
    https://bugzilla.gnome.org/show_bug.cgi?id=678164

 js/ui/messageTray.js |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/js/ui/messageTray.js b/js/ui/messageTray.js
index f0b343e..51d4be3 100644
--- a/js/ui/messageTray.js
+++ b/js/ui/messageTray.js
@@ -2490,11 +2490,10 @@ const MessageTray = new Lang.Class({
     },
 
     _adjustSummaryBoxPointerPosition: function() {
-        // The position of the arrow origin should be the same as center of this._clickedSummaryItem.actor
         if (!this._clickedSummaryItem)
             return;
 
-        this._summaryBoxPointer.setPosition(this._clickedSummaryItem.actor, 0, 0.5);
+        this._summaryBoxPointer.setPosition(this._clickedSummaryItem.actor, 0);
     },
 
     _unsetClickedSummaryItem: function() {