Revert of [Sync] Move //components/sync to the syncer namespace. (patchset #5 id:40001 of https://co

components/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 "components/sync/api/metadata_batch.h"
 
 #include <utility>
 
-namespace syncer {
+namespace syncer_v2 {
 
 MetadataBatch::MetadataBatch() {}
 MetadataBatch::~MetadataBatch() {}
 
 EntityMetadataMap&& MetadataBatch::TakeAllMetadata() {
   return std::move(metadata_map_);
 }
 
 void MetadataBatch::AddMetadata(const std::string& storage_key,
                                 const sync_pb::EntityMetadata& metadata) {
   metadata_map_.insert(std::make_pair(storage_key, metadata));
 }
 
 const sync_pb::DataTypeState& MetadataBatch::GetDataTypeState() const {
   return state_;
 }
 
 void MetadataBatch::SetDataTypeState(const sync_pb::DataTypeState& state) {
   state_ = state;
 }
 
-}  // namespace syncer
+}  // namespace syncer_v2