Bug 595954: use setAttribute for setting notificationbox properties on newly created elements (whose bindings may not yet be attached), r=gavin, a=blocking

--HG--
extra : rebase_source : f8551c7d221e7308aec776528327df7bf2140c61

toolkit/content/widgets/notification.xml

@@ -112,7 +112,7 @@
               }
             }
 
-            newitem.priority = aPriority;
+            newitem.setAttribute("priority", aPriority);
             if (aPriority >= this.PRIORITY_CRITICAL_LOW)
               newitem.setAttribute("type", "critical");
             else if (aPriority <= this.PRIORITY_INFO_HIGH)