Remove #pragma once from chrome/browser/policy

chrome/browser/policy/async_policy_provider.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_ASYNC_POLICY_PROVIDER_H_
 #define CHROME_BROWSER_POLICY_ASYNC_POLICY_PROVIDER_H_
-#pragma once
 
 #include "base/cancelable_callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/policy/configuration_policy_provider.h"
 
 namespace base {
 class MessageLoopProxy;
@@ skipping 45 matching lines @@
   // Callback used to synchronize RefreshPolicies() calls with the FILE thread.
   // See the implementation for the details.
   base::CancelableClosure refresh_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(AsyncPolicyProvider);
 };
 
 }  // namespace policy
 
 #endif  // CHROME_BROWSER_POLICY_ASYNC_POLICY_PROVIDER_H_