Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/api/bluetooth/bluetooth_api_utils.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_BLUETOOTH_BLUETOOTH_API_UTILS_H_
 #define CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_BLUETOOTH_API_UTILS_H_
-#pragma once
 
 #if defined(OS_CHROMEOS)
 
 #include "base/values.h"
 #include "chrome/browser/chromeos/bluetooth/bluetooth_device.h"
 #include "chrome/common/extensions/api/experimental_bluetooth.h"
 
 namespace extensions {
 namespace api {
 namespace experimental_bluetooth {
 
 // Fill in a Device object from a chromeos::BluetoothDevice.
 void BluetoothDeviceToApiDevice(
     const chromeos::BluetoothDevice& device,
     Device* out);
 
 // The caller takes ownership of the returned pointer.
 base::Value* BluetoothDeviceToValue(const chromeos::BluetoothDevice& device);
 
 }  // namespace experimental_bluetooth
 }  // namespace api
 }  // namespace extensions
 
 #endif
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_BLUETOOTH_BLUETOOTH_API_UTILS_H_