ash: Add checks for supervised users.

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>
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
@@ skipping 68 matching lines @@
 DefaultSystemTrayDelegate::GetSupervisedUserManagerName()
     const {
   return base::string16();
 }
 
 const base::string16 DefaultSystemTrayDelegate::GetSupervisedUserMessage()
     const {
   return base::string16();
 }
 
+bool DefaultSystemTrayDelegate::IsUserSupervised() const {
+  return false;
+}
+
 bool DefaultSystemTrayDelegate::SystemShouldUpgrade() const {
   return true;
 }
 
 base::HourClockType DefaultSystemTrayDelegate::GetHourClockType() const {
   return base::k24HourClock;
 }
 
 void DefaultSystemTrayDelegate::ShowSettings() {
 }
@@ skipping 181 matching lines @@
 bool DefaultSystemTrayDelegate::IsSearchKeyMappedToCapsLock() {
   return false;
 }
 
 tray::UserAccountsDelegate* DefaultSystemTrayDelegate::GetUserAccountsDelegate(
     const std::string& user_id) {
   return NULL;
 }
 
 }  // namespace ash