Remove #pragma once from ash

ash/caps_lock_delegate.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 ASH_CAPS_LOCK_DELEGATE_H_
 #define ASH_CAPS_LOCK_DELEGATE_H_
-#pragma once
 
 namespace ash {
 
 // Delegate for toggling Caps Lock.
 class CapsLockDelegate {
  public:
   virtual ~CapsLockDelegate() {}
 
   // A derived class should do either of the following: 1) toggle Caps Lock and
   // return true, or 2) do nothing and return false (see crosbug.com/110127).
   virtual bool HandleToggleCapsLock() = 0;
 };
 }  // namespace ash
 
 #endif  // ASH_CAPS_LOCK_DELEGATE_H_