cros: Remove supervised user methods from SystemTrayDelegate

ash/system/tray/system_tray_delegate.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/tray/system_tray_delegate.h"
 
 #include "ash/system/tray/ime_info.h"
 #include "ash/system/tray/system_tray_item.h"
 
 namespace ash {
@@ skipping 13 matching lines @@
 }
 
 std::string SystemTrayDelegate::GetEnterpriseRealm() const {
   return std::string();
 }
 
 base::string16 SystemTrayDelegate::GetEnterpriseMessage() const {
   return base::string16();
 }
 
-std::string SystemTrayDelegate::GetSupervisedUserManager() const {
-  return std::string();
-}
-
-base::string16 SystemTrayDelegate::GetSupervisedUserManagerName() const {
-  return base::string16();
-}
-
-base::string16 SystemTrayDelegate::GetSupervisedUserMessage() const {
-  return base::string16();
-}
-
 void SystemTrayDelegate::ShowEnterpriseInfo() {}
 
 void SystemTrayDelegate::ShowUserLogin() {}
 
 void SystemTrayDelegate::GetCurrentIME(IMEInfo* info) {}
 
 void SystemTrayDelegate::GetAvailableIMEList(IMEInfoList* list) {}
 
 void SystemTrayDelegate::GetCurrentIMEProperties(IMEPropertyInfoList* list) {}
 
@@ skipping 19 matching lines @@
     base::TimeDelta* session_length_limit) {
   return false;
 }
 
 void SystemTrayDelegate::ActiveUserWasChanged() {}
 
 bool SystemTrayDelegate::IsSearchKeyMappedToCapsLock() {
   return false;
 }
 
-void SystemTrayDelegate::AddCustodianInfoTrayObserver(
-    CustodianInfoTrayObserver* observer) {}
-
-void SystemTrayDelegate::RemoveCustodianInfoTrayObserver(
-    CustodianInfoTrayObserver* observer) {}
-
 std::unique_ptr<SystemTrayItem> SystemTrayDelegate::CreateRotationLockTrayItem(
     SystemTray* tray) {
   return nullptr;
 }
 
 }  // namespace ash