cros: Use SessionController to enable system tray settings / notifications tray

ash/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/system/tray/default_system_tray_delegate.h"
 
 #include <string>
 
 namespace ash {
 
 DefaultSystemTrayDelegate::DefaultSystemTrayDelegate() {}
 
 DefaultSystemTrayDelegate::~DefaultSystemTrayDelegate() {}
 
 LoginStatus DefaultSystemTrayDelegate::GetUserLoginStatus() const {
   return LoginStatus::USER;
 }
 
 std::string DefaultSystemTrayDelegate::GetSupervisedUserManager() const {
   if (!IsUserSupervised())
     return std::string();
   return "manager@chrome.com";
 }
 
 bool DefaultSystemTrayDelegate::IsUserSupervised() const {
   return GetUserLoginStatus() == LoginStatus::SUPERVISED;
 }
 
-bool DefaultSystemTrayDelegate::ShouldShowSettings() const {
-  return true;
-}
-
-bool DefaultSystemTrayDelegate::ShouldShowNotificationTray() const {
-  return true;
-}
-
 }  // namespace ash