Remove #pragma once from content

content/common/url_schemes.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_COMMON_URL_SCHEMES_H_
 #define CONTENT_COMMON_URL_SCHEMES_H_
-#pragma once
 
 #include "content/common/content_export.h"
 
 namespace content {
 
 // Note: ContentMainRunner calls this method internally as part of main
 // initialziation, so this function generally should not be called by
 // embedders. It's exported to facilitate test harnesses that do not
 // utilize ContentMainRunner and that do not wish to lock the set
 // of standard schemes at init time.
 //
 // Called near the beginning of startup to register URL schemes that should
 // be parsed as "standard" with the googleurl library. Optionally, the set
 // of standard schemes is locked down. The embedder can add additional
 // schemes by overriding the ContentClient::AddAdditionalSchemes method.
 CONTENT_EXPORT void RegisterContentSchemes(bool lock_standard_schemes);
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_URL_SCHEMES_H_