Retrive displayed notifications asynchronously

content/browser/notifications/platform_notification_context_impl.cc

Index: content/browser/notifications/platform_notification_context_impl.cc
diff --git a/content/browser/notifications/platform_notification_context_impl.cc b/content/browser/notifications/platform_notification_context_impl.cc
index b2b372fadc86a15294efc4bb012e3bd7ceef2c06..bc3d4369626374e80f39311bbb9947af72e7ed9f 100644
--- a/content/browser/notifications/platform_notification_context_impl.cc
+++ b/content/browser/notifications/platform_notification_context_impl.cc
@@ -219,18 +219,15 @@ void PlatformNotificationContextImpl::
     return;
   }
 
-  std::set<std::string>* notification_ids_ptr = notification_ids.get();
-
-  BrowserThread::PostTaskAndReplyWithResult(
+  BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
-      base::Bind(&PlatformNotificationService::GetDisplayedNotifications,
-                 base::Unretained(service), browser_context_,
-                 notification_ids_ptr),
       base::Bind(
-          &PlatformNotificationContextImpl::
-              SynchronizeDisplayedNotificationsForServiceWorkerRegistration,
-          this, origin, service_worker_registration_id, callback,
-          base::Passed(&notification_ids)));
+          &PlatformNotificationService::GetDisplayedNotificationsAsync,
+          base::Unretained(service), browser_context_,
+          base::Bind(
+              &PlatformNotificationContextImpl::
+                  SynchronizeDisplayedNotificationsForServiceWorkerRegistration,
+              this, origin, service_worker_registration_id, callback)));
 }
 
 void PlatformNotificationContextImpl::