Revert "userMenu: Don't update the presence icon immediately"

This reverts commit f1ca96bbf0.
We're moving towards atomic panel upgrade, so we don't need this.

https://bugzilla.gnome.org/show_bug.cgi?id=683526

js/ui/panelMenu.js

@@ -117,21 +117,6 @@ const Button = new Lang.Class({
             this.setMenu(new PopupMenu.PopupMenu(this.actor, menuAlignment, St.Side.TOP, 0));
 
         this.setName(nameText);
-        this._frozenCount = 0;
-    },
-
-    freeze: function() {
-        this._frozenCount++;
-    },
-
-    thaw: function() {
-        this._frozenCount--;
-        if (this._frozenCount == 0)
-            this.emit('thawed');
-    },
-
-    get frozen() {
-        return this._frozenCount > 0;
     },
 
     setSensitive: function(sensitive) {