Remove #pragma once from sync

sync/engine/commit.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.
 
 #ifndef SYNC_ENGINE_COMMIT_H_
 #define SYNC_ENGINE_COMMIT_H_
-#pragma once
 
 #include "sync/internal_api/public/util/syncer_error.h"
 
 namespace syncer {
 
 namespace sessions {
 class SyncSession;
 }
 
 class Syncer;
@@ skipping 10 matching lines @@
 // The SyncSession parameter contains pointers to various bits of state,
 // including the syncable::Directory that contains all sync items and the
 // ServerConnectionManager used to contact the server.
 SyncerError BuildAndPostCommits(
     Syncer* syncer,
     sessions::SyncSession* session);
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_COMMIT_H_