Remove #pragma once from chrome/browser/policy

chrome/browser/policy/device_status_collector.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_POLICY_DEVICE_STATUS_COLLECTOR_H_
 #define CHROME_BROWSER_POLICY_DEVICE_STATUS_COLLECTOR_H_
-#pragma once
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "chrome/browser/cancelable_request.h"
 #include "chrome/browser/chromeos/version_loader.h"
@@ skipping 135 matching lines @@
   bool report_activity_times_;
   bool report_boot_mode_;
   bool report_location_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceStatusCollector);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_DEVICE_STATUS_COLLECTOR_H_