Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/extension_info_private_api_chromeos.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_INFO_PRIVATE_API_CHROMEOS_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_INFO_PRIVATE_API_CHROMEOS_H_
-#pragma once
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/extensions/extension_function.h"
 
 class GetChromeosInfoFunction : public AsyncExtensionFunction {
  public:
   GetChromeosInfoFunction();
 
  protected:
   virtual ~GetChromeosInfoFunction();
 
   virtual bool RunImpl() OVERRIDE;
 
  private:
   bool GetValue(const std::string& property_name, std::string* value);
 
   DECLARE_EXTENSION_FUNCTION_NAME("chromeosInfoPrivate.get");
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INFO_PRIVATE_API_CHROMEOS_H_