Remove #pragma once from sync

sync/engine/syncproto.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.
 //
 // Wrappers to help us work with ids and protobuffers.
 
 #ifndef SYNC_ENGINE_SYNCPROTO_H_
 #define SYNC_ENGINE_SYNCPROTO_H_
-#pragma once
 
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/protocol/sync.pb.h"
 #include "sync/syncable/syncable_id.h"
 
 namespace syncer {
 
 template<class Base>
 class IdWrapper : public Base {
  public:
@@ skipping 58 matching lines @@
 
 typedef sync_pb::CommitMessage CommitMessage;
 typedef sync_pb::ClientToServerResponse ClientToServerResponse;
 typedef sync_pb::CommitResponse CommitResponse;
 typedef sync_pb::GetUpdatesResponse GetUpdatesResponse;
 typedef sync_pb::GetUpdatesMessage GetUpdatesMessage;
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_SYNCPROTO_H_