Make NativeMediaFileUtil an AsyncFileUtil

chrome/browser/media_galleries/fileapi/itunes/itunes_file_util.h

 // Copyright 2013 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_MEDIA_GALLERIES_FILEAPI_ITUNES_ITUNES_FILE_UTIL_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_ITUNES_ITUNES_FILE_UTIL_H_
 
 #include "chrome/browser/media_galleries/fileapi/native_media_file_util.h"
 
 namespace itunes {
 
 class ItunesFileUtil : public chrome::NativeMediaFileUtil {
  public:
   ItunesFileUtil();
   virtual ~ItunesFileUtil();
 
-  // Overrides from NativeMediaFileUtil
-  virtual base::PlatformFileError GetFileInfo(
+ private:
+  // NativeMediaFileUtil overrides.
+  virtual base::PlatformFileError GetFileInfoSync(
       fileapi::FileSystemOperationContext* context,
       const fileapi::FileSystemURL& url,
       base::PlatformFileInfo* file_info,
       base::FilePath* platform_path) OVERRIDE;
-
-  // Paths are enumerated in lexicographical order.
-  virtual scoped_ptr<AbstractFileEnumerator> CreateFileEnumerator(
+  virtual base::PlatformFileError ReadDirectorySync(
       fileapi::FileSystemOperationContext* context,
-      const fileapi::FileSystemURL& url) OVERRIDE;
-
+      const fileapi::FileSystemURL& url,
+      EntryList* file_list) OVERRIDE;
   virtual base::PlatformFileError GetLocalFilePath(
       fileapi::FileSystemOperationContext* context,
       const fileapi::FileSystemURL& url,
       base::FilePath* local_file_path) OVERRIDE;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ItunesFileUtil);
 };
 
 }  // namespace itunes
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_ITUNES_ITUNES_FILE_UTIL_H_