Remove #pragma once from chrome/browser/policy

chrome/browser/policy/logging_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_LOGGING_WORK_SCHEDULER_H_
 #define CHROME_BROWSER_POLICY_LOGGING_WORK_SCHEDULER_H_
-#pragma once
 
 #include <queue>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/policy/delayed_work_scheduler.h"
@@ skipping 114 matching lines @@
   virtual void PostDelayedWork(const base::Closure& callback, int64 delay)
       OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DummyWorkScheduler);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_LOGGING_WORK_SCHEDULER_H_