[Sync] Move 'sync' target to sync/

chrome/browser/sync/syncable/in_memory_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_IN_MEMORY_DIRECTORY_BACKING_STORE_H_
-#define CHROME_BROWSER_SYNC_SYNCABLE_IN_MEMORY_DIRECTORY_BACKING_STORE_H_
-#pragma once
-
-#include "chrome/browser/sync/syncable/directory_backing_store.h"
-
-namespace syncable {
-
-// This implementation of DirectoryBackingStore is used in tests that do not
-// require us to write to a file.  An in-memory sqlite database is much faster
-// than an on-disk database, so this can result in significant speedups in our
-// unit tests.
-//
-// An InMemoryDirectoryBackingStore cannot load data from existing databases.
-// When an InMemoryDirectoryBackingStore is destroyed, all data stored in this
-// database is lost.  If these limitations are a problem for you, consider using
-// TestDirectoryBackingStore.
-class InMemoryDirectoryBackingStore : public DirectoryBackingStore {
- public:
-  explicit InMemoryDirectoryBackingStore(const std::string& dir_name);
-  virtual DirOpenResult Load(
-      MetahandlesIndex* entry_bucket,
-      Directory::KernelLoadInfo* kernel_load_info) OVERRIDE;
-};
-
-}  // namespace syncable
-
-#endif  // CHROME_BROWSER_SYNC_SYNCABLE_IN_MEMORY_DIRECTORY_BACKING_STORE_H_