Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/api/serial/serial_api.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_EXTENSIONS_API_SERIAL_SERIAL_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_API_H_
-#pragma once
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/api/api_function.h"
 #include "chrome/common/extensions/api/experimental_serial.h"
 #include "net/base/io_buffer.h"
 
 namespace extensions {
 
@@ skipping 110 matching lines @@
   virtual void Work() OVERRIDE;
   virtual bool Respond() OVERRIDE;
 
  private:
   scoped_ptr<api::experimental_serial::Flush::Params> params_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_SERIAL_SERIAL_API_H_