Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/settings/leveldb_settings_storage_factory.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_SETTINGS_LEVELDB_SETTINGS_STORAGE_FACTORY_H_
 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_LEVELDB_SETTINGS_STORAGE_FACTORY_H_
-#pragma once
 
 #include "chrome/browser/extensions/settings/settings_storage_factory.h"
 
 namespace extensions {
 
 // Factory for creating LeveldbValueStore instances.
 class LeveldbSettingsStorageFactory : public SettingsStorageFactory {
  public:
   virtual ValueStore* Create(
       const FilePath& base_path,
       const std::string& extension_id) OVERRIDE;
 
  private:
   // SettingsStorageFactory is refcounted.
   virtual ~LeveldbSettingsStorageFactory() {}
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_LEVELDB_SETTINGS_STORAGE_FACTORY_H_