Bug 1251446 - Can't delete more than 300 items from history treeviews. r=trivial-typo-fix

MozReview-Commit-ID: CoMlnL0Wwht

--HG--
extra : rebase_source : f34984362c5bd2b9940a2241702168bd8c4abad5
extra : amend_source : a34e9cf5a878bc772c5b6decd40e8782d9024a57

browser/components/places/content/controller.js

@@ -972,7 +972,7 @@ PlacesController.prototype = {
         PlacesUtils.bhistory.removePages(URIslice, URIslice.length);
         Services.tm.mainThread.dispatch(() => gen.next(),
                                         Ci.nsIThread.DISPATCH_NORMAL);
-        yield unefined;
+        yield undefined;
       }
     }
     let gen = pagesChunkGenerator(URIs);