Separate the syncing of extension settings and app settings into separate data

chrome/browser/extensions/extension_data_deleter.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_EXTENSION_DATA_DELETER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_DATA_DELETER_H_
 #pragma once
 
 #include "base/file_path.h"
 #include "base/memory/ref_counted.h"
@@ skipping 63 matching lines @@
   void DeleteIndexedDBOnWebkitThread();
 
   // Deletes filesystem files for the extension. May only be called on the
   // file thread.
   void DeleteFileSystemOnFileThread();
 
   // Deletes appcache files for the extension. May only be called on the IO
   // thread.
   void DeleteAppcachesOnIOThread();
 
-  // Deletes extension settings for the extension. Will be called on the FILE
-  // thread via the ExtensionSettingsFrontend.
-  void DeleteExtensionSettingsOnFileThread(ExtensionSettingsBackend* backend);
-
   // The ID of the extension being deleted.
   const std::string extension_id_;
 
   // The database context for deleting the database.
   scoped_refptr<webkit_database::DatabaseTracker> database_tracker_;
 
   // Provides access to the request context.
   scoped_refptr<net::URLRequestContextGetter> extension_request_context_;
 
   // The origin of the extension/app for which we're going to clear data.
@@ skipping 10 matching lines @@
   scoped_refptr<ChromeAppCacheService> appcache_service_;
 
   // If non-empty, the extension we're deleting is an isolated app, and this
   // is its directory which we should delete.
   FilePath isolated_app_path_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionDataDeleter);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_DATA_DELETER_H_