Remove #pragma once from content

content/browser/trace_subscriber_stdio.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 CONTENT_BROWSER_TRACE_SUBSCRIBER_STDIO_H_
 #define CONTENT_BROWSER_TRACE_SUBSCRIBER_STDIO_H_
-#pragma once
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/file_util.h"
 #include "content/public/browser/trace_subscriber.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
@@ skipping 13 matching lines @@
       const scoped_refptr<base::RefCountedString>& data_ptr) OVERRIDE;
 
  private:
   scoped_refptr<TraceSubscriberStdioImpl> impl_;
   DISALLOW_COPY_AND_ASSIGN(TraceSubscriberStdio);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TRACE_SUBSCRIBER_STDIO_H_