[storage] Replace MessageLoopProxy usage with ThreadTaskRunnerHandle

storage/browser/fileapi/file_system_url_request_job_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 STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_URL_REQUEST_JOB_FACTORY_H_
 #define STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_URL_REQUEST_JOB_FACTORY_H_
 
 #include <string>
 
 #include "net/url_request/url_request_job_factory.h"
 
 #include "storage/browser/storage_browser_export.h"
 
-namespace base {
-class MessageLoopProxy;
-}  // namespace base
-
 namespace storage {
 
 class FileSystemContext;
 
 // |context|'s lifetime should exceed the lifetime of the ProtocolHandler.
 // Currently, this is only used by ProfileIOData which owns |context| and the
 // ProtocolHandler.
 STORAGE_EXPORT net::URLRequestJobFactory::ProtocolHandler*
     CreateFileSystemProtocolHandler(const std::string& storage_domain,
                                     FileSystemContext* context);
 
 }  // namespace storage
 
 #endif  // STORAGE_BROWSER_FILEAPI_FILE_SYSTEM_URL_REQUEST_JOB_FACTORY_H_