Use notification display service to collect persistent notifications.

content/browser/notifications/notification_id_generator.h

Index: content/browser/notifications/notification_id_generator.h
diff --git a/content/browser/notifications/notification_id_generator.h b/content/browser/notifications/notification_id_generator.h
index d279e194b37d3c3acf2220244125d7e5d97d9308..1bdee865ae42db18b3ef529c0eb062c0ae835198 100644
--- a/content/browser/notifications/notification_id_generator.h
+++ b/content/browser/notifications/notification_id_generator.h
@@ -40,14 +40,6 @@ class CONTENT_EXPORT NotificationIdGenerator {
   explicit NotificationIdGenerator(BrowserContext* browser_context);
   ~NotificationIdGenerator();
 
-  // Returns whether |notification_id| belongs to a persistent notification.
-  static bool IsPersistentNotification(
-      const base::StringPiece& notification_id);
-
-  // Returns whether |notification_id| belongs to a non-persistent notification.
-  static bool IsNonPersistentNotification(
-      const base::StringPiece& notification_id);
-
   // Generates an id for a persistent notification given the notification's
   // origin, tag and persistent notification id. The persistent notification id
   // will have been created by the persistent notification database.