Remove #pragma once from chrome/browser/policy

chrome/browser/policy/network_configuration_updater.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_NETWORK_CONFIGURATION_UPDATER_H_
 #define CHROME_BROWSER_POLICY_NETWORK_CONFIGURATION_UPDATER_H_
-#pragma once
 
 #include <string>
 
 #include "chrome/browser/chromeos/cros/network_ui_data.h"
 #include "chrome/browser/policy/policy_service.h"
 
 namespace base {
 class Value;
 }
 
@@ skipping 34 matching lines @@
   // Current settings.
   std::string device_network_config_;
   std::string user_network_config_;
 
   DISALLOW_COPY_AND_ASSIGN(NetworkConfigurationUpdater);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_NETWORK_CONFIGURATION_UPDATER_H_