Fix history sidebar (need to QI the root to nsINavHistoryResultQueryNode), regressed by bug 382877

browser/components/places/content/history-panel.js

@@ -155,7 +155,7 @@ function searchHistory(aInput)
   if (aInput) {
     if (!gSearching) {
       // Unset grouping when searching; 
-      var options = gHistoryTree.getResult().root.queryOptions;
+      var options = asQuery(gHistoryTree.getResult().root).queryOptions;
       options.setGroupingMode([], 0);
       gSearching = true;
     }