Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/app_notification_storage.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_APP_NOTIFICATION_STORAGE_H__
 #define CHROME_BROWSER_EXTENSIONS_APP_NOTIFICATION_STORAGE_H__
-#pragma once
 
 #include <set>
 
 #include "chrome/browser/extensions/app_notification.h"
 
 class FilePath;
 
 // Represents storage for app notifications for a particular extension id.
 //
 // IMPORTANT NOTE: Instances of this class should only be used on the FILE
@@ skipping 16 matching lines @@
 
   // Writes the |list| for |extension_id| into storage.
   virtual bool Set(const std::string& extension_id,
                    const AppNotificationList& list) = 0;
 
   // Deletes all data for |extension_id|.
   virtual bool Delete(const std::string& extension_id) = 0;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_APP_NOTIFICATION_STORAGE_H__