Bug 1433492 - Fix a missed callback to .then conversion causing RSS feeds to not show their read/unread status properly after a restart. r=mak

MozReview-Commit-ID: 3iG8JbyGJul

--HG--
extra : rebase_source : 2240904ed63bed5db93354bcc9dd255b0c2fc40c

toolkit/components/places/nsLivemarkService.js

@@ -601,9 +601,9 @@ Livemark.prototype = {
 
     // Update visited status for each entry.
     for (let child of this._children) {
-      history.hasVisits(child.uri, isVisited => {
+      history.hasVisits(child.uri).then(isVisited => {
         this.updateURIVisitedStatus(child.uri, isVisited);
-      });
+      }).catch(Cu.reportError);
     }
 
     return this._children;