Profile shouldn't own DesktopNotificationService.

chrome/browser/notifications/desktop_notification_service_factory.cc

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/notifications/desktop_notification_service_factory.h"
+
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/notifications/desktop_notification_service.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_dependency_manager.h"
+#include "content/browser/browser_thread.h"
+
+// static
+DesktopNotificationService* DesktopNotificationServiceFactory::GetForProfile(
+    Profile* profile) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  return static_cast<DesktopNotificationService*>(
+      GetInstance()->GetServiceForProfile(profile));
+}
+
+void DesktopNotificationServiceFactory::ForceAssociationBetween(
+    Profile* profile,
+    DesktopNotificationService* service) {
+  GetInstance()->Associate(profile, service);
+}
+
+DesktopNotificationServiceFactory* DesktopNotificationServiceFactory::
+    GetInstance() {
+  return Singleton<DesktopNotificationServiceFactory>::get();
+}
+
+DesktopNotificationServiceFactory::DesktopNotificationServiceFactory()
+    : ProfileKeyedServiceFactory(ProfileDependencyManager::GetInstance())
+{}
+
+DesktopNotificationServiceFactory::~DesktopNotificationServiceFactory() {}
+
+ProfileKeyedService* DesktopNotificationServiceFactory::BuildServiceInstanceFor(
+    Profile* profile) const {
+  DesktopNotificationService* service = new DesktopNotificationService(profile,
+      g_browser_process->notification_ui_manager());
+
+  return service;
+}
+
+bool DesktopNotificationServiceFactory::ServiceHasOwnInstanceInIncognito() {
+  return true;
+}