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

sync/syncable/transaction_observer.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_TRANSACTION_OBSERVER_H_
-#define SYNC_SYNCABLE_TRANSACTION_OBSERVER_H_
-
-#include "sync/base/sync_export.h"
-#include "sync/internal_api/public/base/model_type.h"
-#include "sync/syncable/write_transaction_info.h"
-
-namespace syncer {
-namespace syncable {
-
-class SYNC_EXPORT TransactionObserver {
- public:
-  virtual void OnTransactionWrite(
-      const ImmutableWriteTransactionInfo& write_transaction_info,
-      ModelTypeSet models_with_changes) = 0;
- protected:
-  virtual ~TransactionObserver() {}
-};
-
-}  // namespace syncable
-}  // namespace syncer
-
-#endif  // SYNC_SYNCABLE_TRANSACTION_OBSERVER_H_