Add device policy to disallow shutdown - ash UI modifications

chrome/browser/ui/ash/system_tray_delegate_common.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_DELEGATE_COMMON_H_
 #define CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_DELEGATE_COMMON_H_
 
 #include <string>
 
 #include "ash/system/tray/system_tray_delegate.h"
@@ skipping 75 matching lines @@
   bool GetSessionLengthLimit(base::TimeDelta* session_length_limit) override;
   int GetSystemTrayMenuWidth() override;
   void ActiveUserWasChanged() override;
   bool IsSearchKeyMappedToCapsLock() override;
   ash::tray::UserAccountsDelegate* GetUserAccountsDelegate(
       const std::string& user_id) override;
   void AddCustodianInfoTrayObserver(
       ash::CustodianInfoTrayObserver* observer) override;
   void RemoveCustodianInfoTrayObserver(
       ash::CustodianInfoTrayObserver* observer) override;
+  void AddShutdownPolicyObserver(
+      ash::ShutdownPolicyObserver* observer) override;
+  void RemoveShutdownPolicyObserver(
+      ash::ShutdownPolicyObserver* observer) override;
+  void ShouldRebootOnShutdown(
+      const ash::RebootOnShutdownCallback& callback) override;
 
  private:
   ash::SystemTrayNotifier* GetSystemTrayNotifier();
 
   void UpdateClockType();
 
   // content::NotificationObserver implementation.
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
   scoped_ptr<content::NotificationRegistrar> registrar_;
   base::HourClockType clock_type_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTrayDelegateCommon);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_SYSTEM_TRAY_DELEGATE_COMMON_H_