ash: Remove broken display notification suppression when settings is open

ash/system/chromeos/screen_layout_observer.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/screen_layout_observer.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 282 matching lines @@
   WmShell::Get()->RecordUserMetricsAction(
       UMA_STATUS_AREA_DISPLAY_NOTIFICATION_CREATED);
   message_center::MessageCenter::Get()->AddNotification(
       std::move(notification));
 }
 
 void ScreenLayoutObserver::OnDisplayConfigurationChanged() {
   DisplayInfoMap old_info;
   UpdateDisplayInfo(&old_info);
 
-  if (!WmShell::Get()
-           ->system_tray_delegate()
-           ->ShouldShowDisplayNotification()) {
+  if (!show_notifications_for_testing)
     return;
-  }
 
   base::string16 message;
   base::string16 additional_message;
   if (GetDisplayMessageForNotification(old_info, &message, &additional_message))
     CreateOrUpdateNotification(message, additional_message);
 }
 
 }  // namespace ash