Backed out changeset 322fde2d53bf (bug 1356569) so bug 1355161 can be backed out. r=backout

toolkit/components/jsdownloads/src/DownloadIntegration.jsm

@@ -855,7 +855,7 @@ this.DownloadIntegration = {
     if (!DownloadObserver.observersAdded) {
       DownloadObserver.observersAdded = true;
       for (let topic of kObserverTopics) {
-        Services.obs.addObserver(DownloadObserver, topic);
+        Services.obs.addObserver(DownloadObserver, topic, false);
       }
     }
     return Promise.resolve();
@@ -1111,7 +1111,7 @@ this.DownloadObserver = {
 this.DownloadHistoryObserver = function (aList)
 {
   this._list = aList;
-  PlacesUtils.history.addObserver(this);
+  PlacesUtils.history.addObserver(this, false);
 }
 
 this.DownloadHistoryObserver.prototype = {

toolkit/components/jsdownloads/test/unit/head.js

@@ -212,7 +212,7 @@ function promiseWaitForVisit(aUrl) {
     onClearHistory() {},
     onPageChanged() {},
     onDeleteVisits() {},
-  });
+  }, false);
 
   return deferred.promise;
 }