sync: move internal_api components used by chrome/browser into internal_api/public

sync/internal_api/read_transaction.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 SYNC_INTERNAL_API_READ_TRANSACTION_H_
-#define SYNC_INTERNAL_API_READ_TRANSACTION_H_
-
-#include "base/compiler_specific.h"
-#include "sync/internal_api/base_transaction.h"
-
-namespace tracked_objects {
-class Location;
-}  // namespace tracked_objects
-
-namespace sync_api {
-
-struct UserShare;
-
-// Sync API's ReadTransaction is a read-only BaseTransaction.  It wraps
-// a syncable::ReadTransaction.
-class ReadTransaction : public BaseTransaction {
- public:
-  // Start a new read-only transaction on the specified repository.
-  ReadTransaction(const tracked_objects::Location& from_here,
-                  UserShare* share);
-
-  // Resume the middle of a transaction. Will not close transaction.
-  ReadTransaction(UserShare* share, syncable::BaseTransaction* trans);
-
-  virtual ~ReadTransaction();
-
-  // BaseTransaction override.
-  virtual syncable::BaseTransaction* GetWrappedTrans() const OVERRIDE;
- private:
-  void* operator new(size_t size);  // Transaction is meant for stack use only.
-
-  // The underlying syncable object which this class wraps.
-  syncable::BaseTransaction* transaction_;
-  bool close_transaction_;
-
-  DISALLOW_COPY_AND_ASSIGN(ReadTransaction);
-};
-
-} // namespace sync_api
-
-#endif  // SYNC_INTERNAL_API_READ_TRANSACTION_H_