Bug 678259 - Implement mozIVisitInfoCallback::handleResult to avoid exception. r=rnewman

services/sync/modules/engines/history.js

@@ -255,6 +255,7 @@ HistoryStore.prototype = {
 
     let cb = Async.makeSyncCallback();
     let updatePlacesCallback = { 
+      handleResult: function handleResult() {},
       handleError: function handleError(resultCode, placeInfo) {
         failed.push(placeInfo.guid);
       }