[Sync] Move 'sync' target to sync/

chrome/browser/sync/syncable/on_disk_directory_backing_store.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_SYNC_SYNCABLE_ON_DISK_DIRECTORY_BACKING_STORE_H_
-#define CHROME_BROWSER_SYNC_SYNCABLE_ON_DISK_DIRECTORY_BACKING_STORE_H_
-#pragma once
-
-#include "base/file_path.h"
-#include "chrome/browser/sync/syncable/directory_backing_store.h"
-
-namespace syncable {
-
-// This is the concrete class that provides a useful implementation of
-// DirectoryBackingStore.
-class OnDiskDirectoryBackingStore : public DirectoryBackingStore {
- public:
-  OnDiskDirectoryBackingStore(const std::string& dir_name,
-                              const FilePath& backing_filepath);
-  virtual DirOpenResult Load(
-      MetahandlesIndex* entry_bucket,
-      Directory::KernelLoadInfo* kernel_load_info) OVERRIDE;
-
- private:
-  FilePath backing_filepath_;
-};
-
-}  // namespace syncable
-
-#endif  // CHROME_BROWSER_SYNC_SYNCABLE_ON_DISK_DIRECTORY_BACKING_STORE_H_