Use the async version of WebFileSystem::createFileWriter

Source/web/AsyncFileWriterChromium.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 20 matching lines @@
 #include "config.h"
 #include "AsyncFileWriterChromium.h"
 
 #include "WebFileWriter.h"
 #include "core/fileapi/Blob.h"
 #include "modules/filesystem/AsyncFileWriterClient.h"
 #include "public/platform/WebURL.h"
 
 namespace WebCore {
 
+PassOwnPtr<AsyncFileWriterChromium> AsyncFileWriterChromium::create(AsyncFileWriterClient* client)
+{
+    return adoptPtr(new AsyncFileWriterChromium(client));
+}
+
 AsyncFileWriterChromium::AsyncFileWriterChromium(AsyncFileWriterClient* client)
     : m_client(client)
 {
 }
 
 AsyncFileWriterChromium::~AsyncFileWriterChromium()
 {
 }
 
 void AsyncFileWriterChromium::setWebFileWriter(PassOwnPtr<WebKit::WebFileWriter> writer)
@@ skipping 29 matching lines @@
 {
     m_client->didTruncate();
 }
 
 void AsyncFileWriterChromium::didFail(WebKit::WebFileError error)
 {
     m_client->didFail(static_cast<FileError::ErrorCode>(error));
 }
 
 } // namespace