Refactor FileSystemOperation to take callback for each method.

webkit/fileapi/file_system_url_request_job.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 WEBKIT_FILEAPI_FILE_SYSTEM_URL_REQUEST_JOB_H_
 #define WEBKIT_FILEAPI_FILE_SYSTEM_URL_REQUEST_JOB_H_
 #pragma once
 
 #include <string>
 
@@ skipping 37 matching lines @@
 
   // FilterContext methods (via URLRequestJob):
   virtual bool GetMimeType(std::string* mime_type) const OVERRIDE;
 
  private:
   class CallbackDispatcher;
 
   virtual ~FileSystemURLRequestJob();
 
   void StartAsync();
-  void DidGetMetadata(const base::PlatformFileInfo& file_info,
+  void DidGetMetadata(base::PlatformFileError error_code,
+                      const base::PlatformFileInfo& file_info,
                       const FilePath& platform_path);
   void DidOpen(base::PlatformFileError error_code,
                base::PassPlatformFile file, bool created);
   void DidRead(int result);
   void NotifyFailed(int rv);
 
   FileSystemContext* file_system_context_;
   scoped_refptr<base::MessageLoopProxy> file_thread_proxy_;
   base::WeakPtrFactory<FileSystemURLRequestJob> weak_factory_;
   scoped_ptr<net::FileStream> stream_;
   bool is_directory_;
   scoped_ptr<net::HttpResponseInfo> response_info_;
   int64 remaining_bytes_;
   net::HttpByteRange byte_range_;
 
   DISALLOW_COPY_AND_ASSIGN(FileSystemURLRequestJob);
 };
 
 }  // namespace fileapi
 
 #endif  // WEBKIT_FILEAPI_FILE_SYSTEM_URL_REQUEST_JOB_H_