[polari/wip/fmuellner/combined-gsoc: 130/136] a little rewrite as suggested

[Florian Müllner <fmuellner src gnome org>]

commit 76e517684d72c7da50da3447182201bd1ac7ae45
Author: raresv <rares visalom gmail com>
Date:   Wed Jul 27 01:18:21 2016 +0300

    a little rewrite as suggested

 src/userTracker.js |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/src/userTracker.js b/src/userTracker.js
index 85703be..3b21bb1 100644
--- a/src/userTracker.js
+++ b/src/userTracker.js
@@ -176,8 +176,7 @@ const UserTracker = new Lang.Class({
     _clearUsersFromRoom: function(room) {
         let map = this._getRoomContacts(room);
         for ([baseNick, contacts] of map)
-            while (contacts.length > 0)
-                this._untrackMember(contacts[0], room);
+            contacts.slice().forEach((m) => { this._untrackMember(m, room); });
     },
 
     _ensureRoomMappingForRoom: function(room) {