Remove #pragma once from content

content/common/swapped_out_messages.h

 // Copyright (c) 2011 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 CONTENT_COMMON_SWAPPED_OUT_MESSAGES_H_
 #define CONTENT_COMMON_SWAPPED_OUT_MESSAGES_H_
-#pragma once
 
 #include "ipc/ipc_message.h"
 
 namespace content {
 
 // Functions for filtering IPC messages sent from and received from a swapped
 // out renderer.
 class SwappedOutMessages {
  public:
   static bool CanSendWhileSwappedOut(const IPC::Message* msg);
   static bool CanHandleWhileSwappedOut(const IPC::Message& msg);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_SWAPPED_OUT_MESSAGES_H_