Remove dead code related to Notification View Bubble

ash/common/system/chromeos/supervised/tray_supervised_user.cc

 // Copyright 2014 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/common/system/chromeos/supervised/tray_supervised_user.h"
 
 #include <utility>
 
 #include "ash/common/login_status.h"
 #include "ash/common/system/system_notifier.h"
 #include "ash/common/system/tray/label_tray_view.h"
 #include "ash/common/system/tray/system_tray_delegate.h"
-#include "ash/common/system/tray/tray_notification_view.h"
 #include "ash/common/wm_shell.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "grit/ash_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/message_center/message_center.h"
 #include "ui/message_center/notification.h"
 #include "ui/message_center/notification_delegate.h"
 
 using message_center::Notification;
@@ skipping 100 matching lines @@
 
   // Not intended to be used for non-supervised users.
   CHECK(delegate->IsUserSupervised());
 
   if (delegate->IsUserChild())
     return IDR_AURA_UBER_TRAY_CHILD_USER;
   return IDR_AURA_UBER_TRAY_SUPERVISED_USER;
 }
 
 }  // namespace ash