Add device policy to disallow shutdown

chrome/browser/chromeos/power/session_state_controller_delegate_chromeos.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_POWER_SESSION_STATE_CONTROLLER_DELEGATE_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_POWER_SESSION_STATE_CONTROLLER_DELEGATE_CHROMEOS_H_
 
 #include "ash/wm/lock_state_controller.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 
 namespace chromeos {
 
 class SessionStateControllerDelegateChromeos
     : public ash::LockStateControllerDelegate {
  public:
   SessionStateControllerDelegateChromeos() {}
   virtual ~SessionStateControllerDelegateChromeos() {}
 
  private:
   // SessionStateControllerDelegate implementation.
   virtual void RequestLockScreen() override;
+  virtual void RequestRestart() override;
   virtual void RequestShutdown() override;
 
   DISALLOW_COPY_AND_ASSIGN(SessionStateControllerDelegateChromeos);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_POWER_SESSION_STATE_CONTROLLER_DELEGATE_CHROMEOS_H_