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

sync/syncable/syncable_model_neutral_write_transaction.cc

-// Copyright 2013 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 "sync/syncable/syncable_model_neutral_write_transaction.h"
-
-#include "sync/syncable/directory.h"
-
-namespace syncer {
-namespace syncable {
-
-ModelNeutralWriteTransaction::ModelNeutralWriteTransaction(
-    const tracked_objects::Location& location,
-    WriterTag writer, Directory* directory)
-    : BaseWriteTransaction(location,
-                           "ModelNeutralWriteTransaction",
-                           writer,
-                           directory) {
-  Lock();
-}
-
-ModelNeutralWriteTransaction::~ModelNeutralWriteTransaction() {
-  directory()->CheckInvariantsOnTransactionClose(this, modified_handles_);
-  HandleUnrecoverableErrorIfSet();
-  Unlock();
-}
-
-void ModelNeutralWriteTransaction::TrackChangesTo(const EntryKernel* entry) {
-  modified_handles_.insert(entry->ref(META_HANDLE));
-}
-
-}  // namespace syncable
-}  // namespace syncer