Remove #pragma once from chrome/browser/policy

chrome/browser/policy/policy_constants.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_POLICY_CONSTANTS_H_
 #define CHROME_BROWSER_POLICY_POLICY_CONSTANTS_H_
-#pragma once
 
 namespace policy {
 
 // The scope of a policy flags whether it is meant to be applied to the current
 // user or to the machine.
 enum PolicyScope {
   // USER policies apply to sessions of the current user.
   POLICY_SCOPE_USER,
 
   // MACHINE policies apply to any users of the current machine.
   POLICY_SCOPE_MACHINE,
 };
 
 // The level of a policy determines its enforceability and whether users can
 // override it or not. The values are listed in increasing order of priority.
 enum PolicyLevel {
   // RECOMMENDED policies can be overridden by users. They are meant as a
   // default value configured by admins, that users can customize.
   POLICY_LEVEL_RECOMMENDED,
 
   // MANDATORY policies must be enforced and users can't circumvent them.
   POLICY_LEVEL_MANDATORY,
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_POLICY_CONSTANTS_H_