Convert drive::FileWriteHelper to a single function for simplification.

chrome/browser/chromeos/drive/download_handler.cc

 // 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.
 
 #include "chrome/browser/chromeos/drive/download_handler.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/supports_user_data.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/drive_integration_service.h"
 #include "chrome/browser/chromeos/drive/file_system_interface.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
-#include "chrome/browser/chromeos/drive/file_write_helper.h"
+#include "chrome/browser/chromeos/drive/write_on_cache_file.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
 using content::DownloadManager;
 using content::DownloadItem;
 
 namespace drive {
 namespace {
 
 // Key for base::SupportsUserData::Data.
@@ skipping 62 matching lines @@
 bool IsPersistedDriveDownload(const base::FilePath& drive_tmp_download_path,
                               DownloadItem* download) {
   // Persisted downloads are not in IN_PROGRESS state when created, while newly
   // created downloads are.
   return drive_tmp_download_path.IsParent(download->GetTargetFilePath()) &&
       download->GetState() != DownloadItem::IN_PROGRESS;
 }
 
 }  // namespace
 
-DownloadHandler::DownloadHandler(
-    FileWriteHelper* file_write_helper,
-    FileSystemInterface* file_system)
-    : file_write_helper_(file_write_helper),
-      file_system_(file_system),
+DownloadHandler::DownloadHandler(FileSystemInterface* file_system)
+    : file_system_(file_system),
       weak_ptr_factory_(this) {
 }
 
 DownloadHandler::~DownloadHandler() {
 }
 
 // static
 DownloadHandler* DownloadHandler::GetForProfile(Profile* profile) {
   DriveIntegrationService* integration_service =
       DriveIntegrationServiceFactory::FindForProfile(profile);
@@ skipping 183 matching lines @@
         callback);
   } else {
     LOG(WARNING) << "Failed to create directory, error = "
                  << FileErrorToString(error);
     callback.Run(base::FilePath());
   }
 }
 
 void DownloadHandler::UploadDownloadItem(DownloadItem* download) {
   DCHECK_EQ(DownloadItem::COMPLETE, download->GetState());
-  file_write_helper_->PrepareWritableFileAndRun(
+  WriteOnCacheFile(
+      file_system_,
       util::ExtractDrivePath(GetTargetPath(download)),
       base::Bind(&MoveDownloadedFile, download->GetTargetFilePath()));
 }
 
 }  // namespace drive