[Sync] Move some directory-related things from core/ to syncable/.

components/sync/core/base_transaction.cc

-// 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.
-
-#include "components/sync/core/base_transaction.h"
-
-#include "components/sync/syncable/directory.h"
-#include "components/sync/syncable/nigori_handler.h"
-
-namespace syncer {
-
-//////////////////////////////////////////////////////////////////////////
-// BaseTransaction member definitions
-BaseTransaction::BaseTransaction(UserShare* share) : user_share_(share) {
-  DCHECK(share && share->directory.get());
-}
-
-BaseTransaction::~BaseTransaction() {}
-
-Cryptographer* BaseTransaction::GetCryptographer() const {
-  return GetDirectory()->GetCryptographer(this->GetWrappedTrans());
-}
-
-ModelTypeSet BaseTransaction::GetEncryptedTypes() const {
-  syncable::NigoriHandler* nigori_handler = GetDirectory()->GetNigoriHandler();
-  return nigori_handler
-             ? nigori_handler->GetEncryptedTypes(this->GetWrappedTrans())
-             : ModelTypeSet();
-}
-
-}  // namespace syncer