drive: Rename DriveFileSystemMetadata to FileSystemMetadata

chrome/browser/chromeos/drive/drive_file_system_metadata.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_DRIVE_FILE_SYSTEM_METADATA_H_
-#define CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_METADATA_H_
-
-#include "base/basictypes.h"
-#include "base/time.h"
-#include "chrome/browser/chromeos/drive/file_errors.h"
-
-namespace drive {
-
-// Metadata of DriveFileSystem. Used by DriveFileSystem::GetMetadata().
-struct DriveFileSystemMetadata {
-  DriveFileSystemMetadata();
-  ~DriveFileSystemMetadata();
-
-  // The largest changestamp that the file system holds (may be different
-  // from the one on the server)
-  int64 largest_changestamp;
-
-  // True if the feed is now being fetched from the server.
-  bool refreshing;
-
-  // Time of the last update check.
-  base::Time last_update_check_time;
-
-  // Error code of the last update check.
-  FileError last_update_check_error;
-};
-
-}  // namespace drive
-
-#endif  // CHROME_BROWSER_CHROMEOS_DRIVE_DRIVE_FILE_SYSTEM_METADATA_H_