Profile shouldn't own DesktopNotificationService.

chrome/browser/notifications/desktop_notification_service.h

Index: chrome/browser/notifications/desktop_notification_service.h
diff --git a/chrome/browser/notifications/desktop_notification_service.h b/chrome/browser/notifications/desktop_notification_service.h
index a5c05a9c3902a5a25f32a97cd00636e7c2bb2079..50f28f5f5c7ca8d5a043d03b2920a1b2c0c13397 100644
--- a/chrome/browser/notifications/desktop_notification_service.h
+++ b/chrome/browser/notifications/desktop_notification_service.h
@@ -16,6 +16,7 @@
 #include "chrome/browser/content_settings/content_settings_notification_provider.h"
 #include "chrome/browser/content_settings/content_settings_provider.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
+#include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/common/content_settings.h"
 #include "content/common/notification_observer.h"
 #include "content/common/notification_registrar.h"
@@ -32,7 +33,8 @@ struct DesktopNotificationHostMsg_Show_Params;
 
 // The DesktopNotificationService is an object, owned by the Profile,
 // which provides the creation of desktop "toasts" to web pages and workers.
-class DesktopNotificationService : public NotificationObserver {
+class DesktopNotificationService : public NotificationObserver,
+                                   public ProfileKeyedService {
  public:
   enum DesktopNotificationSource {
     PageNotification,