Issue 3222 - Remove ancient dead code

chrome/content/ui/sidebar.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 479 matching lines @@
 
 function editFilter()
 {
   var item = treeView.getSelectedItem();
   if (treeView.data && !treeView.data.length)
     item = treeView.getDummyTooltip();
 
   if (!("filter" in item) || !item.filter)
     return;
 
-  if (!("location") in item)
-    item.location = undefined
-
   UI.openFiltersDialog(item.filter);
 }
 
 function enableFilter(filter, enable) {
   filter.disabled = !enable;
 
   treeView.boxObject.invalidate();
 }
 
 /**
@@ skipping 741 matching lines @@
       return {tooltip: this.itemsDummyTooltip};
   },
 
   invalidateItem: function(item)
   {
     let row = this.data.indexOf(item);
     if (row >= 0)
       this.boxObject.invalidateRow(row);
   }
 }