Remove #pragma once from sync

sync/engine/update_applicator.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.
 //
 // An UpdateApplicator is used to iterate over a number of unapplied updates,
 // applying them to the client using the given syncer session.
 //
 // UpdateApplicator might resemble an iterator, but it actually keeps retrying
 // failed updates until no remaining updates can be successfully applied.
 
 #ifndef SYNC_ENGINE_UPDATE_APPLICATOR_H_
 #define SYNC_ENGINE_UPDATE_APPLICATOR_H_
-#pragma once
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/port.h"
 #include "sync/internal_api/public/engine/model_safe_worker.h"
 #include "sync/syncable/syncable_id.h"
 
 namespace syncer {
 
@@ skipping 81 matching lines @@
 
   // Track the result of the attempts to update applications.
   ResultTracker application_results_;
 
   DISALLOW_COPY_AND_ASSIGN(UpdateApplicator);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_UPDATE_APPLICATOR_H_