Bug 1541388 - Remove Array generics from NewTabUtils.jsm. r=dao

Differential Revision: https://phabricator.services.mozilla.com/D25922

--HG--
extra : moz-landing-system : lando

toolkit/modules/NewTabUtils.jsm

@@ -1617,7 +1617,7 @@ var Links = {
    * @return The links in the grid.
    */
   getLinks: function Links_getLinks() {
-    let pinnedLinks = Array.slice(PinnedLinks.links);
+    let pinnedLinks = Array.from(PinnedLinks.links);
     let links = this._getMergedProviderLinks();
 
     let sites = new Set();