Issue 1409 - Fix some errors in adblockplustest

chrome/content/tests/popupBlocker.js

 (function()
 {
   let server = null;
   let frame = null;
 
   module("Pop-up blocker", {
     setup: function()
     {
       prepareFilterComponents.call(this, true);
       preparePrefs.call(this);
@@ skipping 87 matching lines @@
           browser.contentWindow.close();
         }, false);
       });
     }
 
     function onTabClose(event)
     {
       wnd.gBrowser.tabContainer.removeEventListener("TabClose", onTabClose, false);
       ok(result == successful, "Opening tab with filter " + filter.text);
       var keys = [];
-      for (key in defaultMatcher.blacklist.keywordByFilter)
+      for (let key in defaultMatcher.blacklist.keywordByFilter)
         keys.push(key);
 
       FilterStorage.removeFilter(filter);
       start();
     }
 
     wnd.gBrowser.tabContainer.addEventListener("TabOpen", onTabOpen, false);
     wnd.gBrowser.tabContainer.addEventListener("TabClose", onTabClose, false);
     let timeout = window.setTimeout(onTabClose, 1000);    // In case the tab isn't opened
 
     frame.contentDocument.getElementById("link").click();
   }
 
   for (let [filter, result] of tests)
     asyncTest(filter, runTest.bind(null, Filter.fromText(filter), result));
 })();