Remove #pragma once from chrome/browser/policy

chrome/browser/policy/managed_mode_policy_provider_factory.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_MANAGED_MODE_POLICY_PROVIDER_FACTORY_H_
 #define CHROME_BROWSER_POLICY_MANAGED_MODE_POLICY_PROVIDER_FACTORY_H_
-#pragma once
 
 #include "base/memory/singleton.h"
 #include "chrome/browser/profiles/profile_keyed_service_factory.h"
 
 class Profile;
 
 namespace policy {
 class ManagedModePolicyProvider;
 }
 
 class ManagedModePolicyProviderFactory : public ProfileKeyedServiceFactory {
  public:
   static ManagedModePolicyProviderFactory* GetInstance();
 
   static policy::ManagedModePolicyProvider* GetForProfile(Profile* profile);
 
  private:
   friend struct DefaultSingletonTraits<ManagedModePolicyProviderFactory>;
 
   ManagedModePolicyProviderFactory();
   virtual ~ManagedModePolicyProviderFactory();
 
   virtual ProfileKeyedService* BuildServiceInstanceFor(
       Profile* profile) const OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(ManagedModePolicyProviderFactory);
 };
 
 #endif  // CHROME_BROWSER_POLICY_MANAGED_MODE_POLICY_PROVIDER_FACTORY_H_