The 1st patch to disambiguate message center notifications

ash/system/chromeos/managed/tray_locally_managed_user.cc

Index: ash/system/chromeos/managed/tray_locally_managed_user.cc
diff --git a/ash/system/chromeos/managed/tray_locally_managed_user.cc b/ash/system/chromeos/managed/tray_locally_managed_user.cc
index 2758879286d4e6f0b6518385a3090f59588e03a2..d44cabb62d266070724062dea151fa4c26cc50cd 100644
--- a/ash/system/chromeos/managed/tray_locally_managed_user.cc
+++ b/ash/system/chromeos/managed/tray_locally_managed_user.cc
@@ -39,7 +39,8 @@ void TrayLocallyManagedUser::UpdateMessage() {
       GetLocallyManagedUserMessage();
   if (tray_view_)
     tray_view_->SetMessage(message);
-  if (message_center::MessageCenter::Get()->HasNotification(kNotificationId))
+  if (message_center::MessageCenter::Get()->FindVisibleNotificationById(
+      kNotificationId) != NULL)
     CreateOrUpdateNotification(message);
 }