Profile shouldn't own DesktopNotificationService.

chrome/browser/profiles/profile_keyed_service_factory.cc

Index: chrome/browser/profiles/profile_keyed_service_factory.cc
diff --git a/chrome/browser/profiles/profile_keyed_service_factory.cc b/chrome/browser/profiles/profile_keyed_service_factory.cc
index cea66c933c15bcf94451f9538da6907f1cc9ffa6..887c9759da463e6fd32416860c7f03ffeda6466d 100644
--- a/chrome/browser/profiles/profile_keyed_service_factory.cc
+++ b/chrome/browser/profiles/profile_keyed_service_factory.cc
@@ -13,7 +13,7 @@
 
 ProfileKeyedServiceFactory::ProfileKeyedServiceFactory(
     ProfileDependencyManager* manager)
-    : dependency_manager_(manager) {
+    : dependency_manager_(manager), factory_(NULL) {
   dependency_manager_->AddComponent(this);
 }
 
@@ -40,7 +40,11 @@ ProfileKeyedService* ProfileKeyedServiceFactory::GetServiceForProfile(
   if (it != mapping_.end())
     return it->second;
 
-  ProfileKeyedService* service = BuildServiceInstanceFor(profile);
+  ProfileKeyedService* service;
+  if (factory_)
+    service = factory_(profile);
+  else
+    service = BuildServiceInstanceFor(profile);
   Associate(profile, service);
   return service;
 }