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

components/sync/core/base_transaction.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 COMPONENTS_SYNC_CORE_BASE_TRANSACTION_H_
-#define COMPONENTS_SYNC_CORE_BASE_TRANSACTION_H_
-
-#include "base/macros.h"
-#include "components/sync/base/cryptographer.h"
-#include "components/sync/base/model_type.h"
-#include "components/sync/core/user_share.h"
-
-namespace syncer {
-
-namespace syncable {
-class BaseTransaction;
-class Directory;
-}
-
-// Sync API's BaseTransaction, ReadTransaction, and WriteTransaction allow for
-// batching of several read and/or write operations.  The read and write
-// operations are performed by creating ReadNode and WriteNode instances using
-// the transaction. These transaction classes wrap identically named classes in
-// syncable, and are used in a similar way. Unlike syncable::BaseTransaction,
-// whose construction requires an explicit syncable::Directory, a sync
-// API BaseTransaction is created from a UserShare object.
-//
-// Note, these transactions are not atomic. Individual operations can
-// fail. There is no built-in rollback or undo mechanism.
-class BaseTransaction {
- public:
-  // Provide access to the underlying syncable objects from BaseNode.
-  virtual syncable::BaseTransaction* GetWrappedTrans() const = 0;
-  Cryptographer* GetCryptographer() const;
-  ModelTypeSet GetEncryptedTypes() const;
-
-  syncable::Directory* GetDirectory() const {
-    if (!user_share_) {
-      return NULL;
-    } else {
-      return user_share_->directory.get();
-    }
-  }
-
-  UserShare* GetUserShare() const { return user_share_; }
-
- protected:
-  explicit BaseTransaction(UserShare* share);
-  virtual ~BaseTransaction();
-
-  BaseTransaction() : user_share_(NULL) {}
-
- private:
-  UserShare* user_share_;
-
-  DISALLOW_COPY_AND_ASSIGN(BaseTransaction);
-};
-
-}  // namespace syncer
-
-#endif  // COMPONENTS_SYNC_CORE_BASE_TRANSACTION_H_