Remove #pragma once from chrome/browser/policy

chrome/browser/policy/policy_service_impl.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_SERVICE_IMPL_H_
 #define CHROME_BROWSER_POLICY_POLICY_SERVICE_IMPL_H_
-#pragma once
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/observer_list.h"
 #include "chrome/browser/policy/configuration_policy_provider.h"
 #include "chrome/browser/policy/policy_bundle.h"
@@ skipping 79 matching lines @@
   // List of callbacks to invoke once all providers refresh after a
   // RefreshPolicies() call.
   std::vector<base::Closure> refresh_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(PolicyServiceImpl);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_POLICY_SERVICE_IMPL_H_