Remove CloseFile from FileSystem.

chrome/browser/chromeos/drive/file_write_helper.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_FILE_WRITE_HELPER_H_
 #define CHROME_BROWSER_CHROMEOS_DRIVE_FILE_WRITE_HELPER_H_
 
+#include "base/callback_forward.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/chromeos/drive/file_errors.h"
-#include "chrome/browser/chromeos/drive/file_system_interface.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace drive {
 
+class FileSystemInterface;
+
 // This class provides higher level operations for writing to Drive files over
 // FileSystemInterface.
 class FileWriteHelper {
  public:
+  // Callback for PrepareWritableFileAndRun.
+  typedef base::Callback<void(FileError error,
+                              const base::FilePath& file_path)>
+      OpenFileCallback;
+
   explicit FileWriteHelper(FileSystemInterface* file_system);
   ~FileWriteHelper();
 
   // Prepares a local temporary file path and passes it to |callback| on the
   // blocking thread pool that allows file operations. The modification to
   // the file is reflected to GData |path|. If |path| does not exist, a new
   // file is created.
   //
   // Must be called from UI thread.
   void PrepareWritableFileAndRun(const base::FilePath& path,
                                  const OpenFileCallback& callback);
 
  private:
   // Part of PrepareWritableFilePathAndRun(). It tries CreateFile for the case
   // file does not exist yet, does OpenFile to download and mark the file as
-  // dirty, runs |callback|, and finally calls CloseFile.
+  // dirty, runs |callback|, and finally closes the file.
   void PrepareWritableFileAndRunAfterOpenFile(
       const base::FilePath& file_path,
       const OpenFileCallback& callback,
       FileError result,
-      const base::FilePath& local_cache_path);
-  void PrepareWritableFileAndRunAfterCallback(const base::FilePath& file_path);
+      const base::FilePath& local_cache_path,
+      const base::Closure& close_callback);
 
   FileSystemInterface* file_system_;  // Owned by DriveIntegrationService.
 
   // WeakPtrFactory bound to the UI thread.
   // 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<FileWriteHelper> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FileWriteHelper);
 };
 
 }  // namespace drive
 
 #endif  // CHROME_BROWSER_CHROMEOS_DRIVE_FILE_WRITE_HELPER_H_