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

chrome/browser/chromeos/drive/download_handler.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 CHROME_BROWSER_CHROMEOS_DRIVE_DOWNLOAD_HANDLER_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_DOWNLOAD_HANDLER_H_
 
 #include "base/callback_forward.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/chromeos/drive/file_errors.h"
 #include "chrome/browser/download/all_download_item_notifier.h"
 #include "content/public/browser/download_manager_delegate.h"
 
 class Profile;
 
 namespace content {
 class DownloadItem;
 class DownloadManager;
 }
 
 namespace drive {
 
 class FileSystemInterface;
-class FileWriteHelper;
 class ResourceEntry;
 
 // Observes downloads to temporary local drive folder. Schedules these
 // downloads for upload to drive service.
 class DownloadHandler : public AllDownloadItemNotifier::Observer {
  public:
-  DownloadHandler(FileWriteHelper* file_write_helper,
-                  FileSystemInterface* file_system);
+  explicit DownloadHandler(FileSystemInterface* file_system);
   virtual ~DownloadHandler();
 
   // Utility method to get DownloadHandler with profile.
   static DownloadHandler* GetForProfile(Profile* profile);
 
   // Become an observer of DownloadManager.
   void Initialize(content::DownloadManager* download_manager,
                   const base::FilePath& drive_tmp_download_path);
 
   // Callback used to return results from SubstituteDriveDownloadPath.
@@ skipping 41 matching lines @@
                     scoped_ptr<ResourceEntry> entry);
 
   // Callback for FileSystem::CreateDirectory().
   // Used to implement SubstituteDriveDownloadPath().
   void OnCreateDirectory(const SubstituteDriveDownloadPathCallback& callback,
                          FileError error);
 
   // Starts the upload of a downloaded/downloading file.
   void UploadDownloadItem(content::DownloadItem* download);
 
-  FileWriteHelper* file_write_helper_;
   FileSystemInterface* file_system_;  // Owned by DriveIntegrationService.
   // Observe the DownloadManager for new downloads.
   scoped_ptr<AllDownloadItemNotifier> notifier_;
 
   // Temporary download location directory.
   base::FilePath drive_tmp_download_path_;
 
   // Note: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<DownloadHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DownloadHandler);
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DOWNLOAD_HANDLER_H_