Remove #pragma once from chrome/browser/policy

chrome/browser/policy/delayed_work_scheduler.h

 // Copyright (c) 2011 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_POLICY_DELAYED_WORK_SCHEDULER_H_
 #define CHROME_BROWSER_POLICY_DELAYED_WORK_SCHEDULER_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/timer.h"
 
 namespace policy {
 
 // A mockable class for scheduling and cancelling a delayed task.
 // This is only a thin wrapper around base::OneShotTimer.
 // This class is not thread-safe: all its methods should be called on the same
@@ skipping 14 matching lines @@
   base::Closure callback_;
 
   void DoDelayedWork();
 
   DISALLOW_COPY_AND_ASSIGN(DelayedWorkScheduler);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_DELAYED_WORK_SCHEDULER_H_