[Sync] Move //sync to //components/sync.

sync/syncable/on_disk_directory_backing_store.h

-// Copyright 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 SYNC_SYNCABLE_ON_DISK_DIRECTORY_BACKING_STORE_H_
-#define SYNC_SYNCABLE_ON_DISK_DIRECTORY_BACKING_STORE_H_
-
-#include <string>
-
-#include "base/files/file_path.h"
-#include "base/macros.h"
-#include "sync/base/sync_export.h"
-#include "sync/syncable/directory_backing_store.h"
-
-namespace syncer {
-namespace syncable {
-
-// This is the concrete class that provides a useful implementation of
-// DirectoryBackingStore.
-class SYNC_EXPORT OnDiskDirectoryBackingStore : public DirectoryBackingStore {
- public:
-  OnDiskDirectoryBackingStore(const std::string& dir_name,
-                              const base::FilePath& backing_file_path);
-  ~OnDiskDirectoryBackingStore() override;
-  DirOpenResult Load(Directory::MetahandlesMap* handles_map,
-                     JournalIndex* delete_journals,
-                     MetahandleSet* metahandles_to_purge,
-                     Directory::KernelLoadInfo* kernel_load_info) override;
-
- protected:
-  // Subclasses may override this to avoid a possible DCHECK.
-  virtual void ReportFirstTryOpenFailure();
-
-  // Returns the file path of the back store.
-  const base::FilePath& backing_file_path() const;
-
- private:
-  // A helper function that will make one attempt to load the directory.
-  // Unlike Load(), it does not attempt to recover from failure.
-  DirOpenResult TryLoad(Directory::MetahandlesMap* handles_map,
-                        JournalIndex* delete_journals,
-                        MetahandleSet* metahandles_to_purge,
-                        Directory::KernelLoadInfo* kernel_load_info);
-
-  // The path to the sync DB.
-  const base::FilePath backing_file_path_;
-
-  DISALLOW_COPY_AND_ASSIGN(OnDiskDirectoryBackingStore);
-};
-
-}  // namespace syncable
-}  // namespace syncer
-
-#endif  // SYNC_SYNCABLE_ON_DISK_DIRECTORY_BACKING_STORE_H_