[gnome-shell/gnome-3-28] workspaceThumbnail: remove unused private win reference

[Florian Müllner <fmuellner src gnome org>]

commit 02c5b4b94719c0ec7c4ea967f7ad018adb1c9884
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Fri Jun 29 11:21:59 2018 +0200

    workspaceThumbnail: remove unused private win reference

 js/ui/workspaceThumbnail.js | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/js/ui/workspaceThumbnail.js b/js/ui/workspaceThumbnail.js
index e11f32afb..aff2b4abc 100644
--- a/js/ui/workspaceThumbnail.js
+++ b/js/ui/workspaceThumbnail.js
@@ -372,8 +372,6 @@ var WorkspaceThumbnail = new Lang.Class({
     },
 
     _doRemoveWindow(metaWin) {
-        let win = metaWin.get_compositor_private();
-
         // find the position of the window in our list
         let index = this._lookupIndex (metaWin);