Refactor FileSystemMountPointProvider::CreateFileStream{Reader,Writer}

webkit/fileapi/isolated_mount_point_provider.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 WEBKIT_FILEAPI_ISOLATED_MOUNT_POINT_PROVIDER_H_
 #define WEBKIT_FILEAPI_ISOLATED_MOUNT_POINT_PROVIDER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "webkit/fileapi/file_system_mount_point_provider.h"
 #include "webkit/fileapi/media/mtp_device_file_system_config.h"
@@ skipping 30 matching lines @@
   virtual void InitializeCopyOrMoveFileValidatorFactory(
       FileSystemType type,
       scoped_ptr<CopyOrMoveFileValidatorFactory> factory) OVERRIDE;
   virtual FilePermissionPolicy GetPermissionPolicy(
       const FileSystemURL& url,
       int permissions) const OVERRIDE;
   virtual FileSystemOperation* CreateFileSystemOperation(
       const FileSystemURL& url,
       FileSystemContext* context,
       base::PlatformFileError* error_code) const OVERRIDE;
-  virtual webkit_blob::FileStreamReader* CreateFileStreamReader(
+  virtual scoped_ptr<webkit_blob::FileStreamReader> CreateFileStreamReader(
       const FileSystemURL& url,
       int64 offset,
       const base::Time& expected_modification_time,
       FileSystemContext* context) const OVERRIDE;
-  virtual FileStreamWriter* CreateFileStreamWriter(
+  virtual scoped_ptr<FileStreamWriter> CreateFileStreamWriter(
       const FileSystemURL& url,
       int64 offset,
       FileSystemContext* context) const OVERRIDE;
   virtual FileSystemQuotaUtil* GetQuotaUtil() OVERRIDE;
   virtual void DeleteFileSystem(
       const GURL& origin_url,
       FileSystemType type,
       FileSystemContext* context,
       const DeleteFileSystemCallback& callback) OVERRIDE;
 
@@ skipping 10 matching lines @@
   scoped_ptr<AsyncFileUtilAdapter> native_media_file_util_;
 
 #if defined(SUPPORT_MTP_DEVICE_FILESYSTEM)
   scoped_ptr<DeviceMediaAsyncFileUtil> device_media_async_file_util_;
 #endif
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_ISOLATED_MOUNT_POINT_PROVIDER_H_