The 1st patch to disambiguate message center notifications

ash/system/chromeos/managed/tray_locally_managed_user.cc

 // Copyright (c) 2012 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 "ash/system/chromeos/managed/tray_locally_managed_user.h"
 
 #include "ash/shell.h"
 #include "ash/system/chromeos/label_tray_view.h"
 #include "ash/system/system_notifier.h"
 #include "ash/system/tray/system_tray_notifier.h"
@@ skipping 21 matching lines @@
 }
 
 TrayLocallyManagedUser::~TrayLocallyManagedUser() {
 }
 
 void TrayLocallyManagedUser::UpdateMessage() {
   base::string16 message = Shell::GetInstance()->system_tray_delegate()->
       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);
 }
 
 views::View* TrayLocallyManagedUser::CreateDefaultView(
     user::LoginStatus status) {
   CHECK(tray_view_ == NULL);
   if (status != ash::user::LOGGED_IN_LOCALLY_MANAGED)
     return NULL;
 
   tray_view_ = new LabelTrayView(this, IDR_AURA_UBER_TRAY_MANAGED_USER);
@@ skipping 29 matching lines @@
           kNotificationId,
           base::string16() /* no title */,
           new_message,
           bundle.GetImageNamed(IDR_AURA_UBER_TRAY_MANAGED_USER),
           system_notifier::kNotifierLocallyManagedUser,
           base::Closure() /* null callback */));
   message_center::MessageCenter::Get()->AddNotification(notification.Pass());
 }
 
 }  // namespace ash