ash: Remove broken display notification suppression when settings is open

ash/common/system/tray/default_system_tray_delegate.cc

 // Copyright 2013 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/tray/default_system_tray_delegate.h"
 
 #include <string>
 #include <utility>
 
 #include "ash/common/system/networking_config_delegate.h"
@@ skipping 26 matching lines @@
   DCHECK(info);
   info->severity = UpdateInfo::UPDATE_NONE;
   info->update_required = true;
   info->factory_reset_required = false;
 }
 
 bool DefaultSystemTrayDelegate::ShouldShowSettings() {
   return true;
 }
 
-bool DefaultSystemTrayDelegate::ShouldShowDisplayNotification() {
-  return false;
-}
-
 void DefaultSystemTrayDelegate::ToggleBluetooth() {
   bluetooth_enabled_ = !bluetooth_enabled_;
 }
 
 bool DefaultSystemTrayDelegate::IsBluetoothDiscovering() {
   return false;
 }
 
 bool DefaultSystemTrayDelegate::GetBluetoothAvailable() {
   return true;
@@ skipping 16 matching lines @@
     std::unique_ptr<VolumeControlDelegate> delegate) {
   volume_control_delegate_ = std::move(delegate);
 }
 
 int DefaultSystemTrayDelegate::GetSystemTrayMenuWidth() {
   // This is the default width for English languages.
   return 300;
 }
 
 }  // namespace ash