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

sync/api/metadata_batch.cc

-// Copyright 2016 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/api/metadata_batch.h"
-
-namespace syncer_v2 {
-
-MetadataBatch::MetadataBatch() {}
-MetadataBatch::~MetadataBatch() {}
-
-EntityMetadataMap&& MetadataBatch::TakeAllMetadata() {
-  return std::move(metadata_map_);
-}
-
-void MetadataBatch::AddMetadata(const std::string& client_tag,
-                                const sync_pb::EntityMetadata& metadata) {
-  metadata_map_.insert(std::make_pair(client_tag, metadata));
-}
-
-const sync_pb::DataTypeState& MetadataBatch::GetDataTypeState() const {
-  return state_;
-}
-
-void MetadataBatch::SetDataTypeState(const sync_pb::DataTypeState& state) {
-  state_ = state;
-}
-
-}  // namespace syncer_v2