Remove #pragma once from sync

sync/engine/conflict_resolver.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.
 //
 // A class that watches the syncer and attempts to resolve any conflicts that
 // occur.
 
 #ifndef SYNC_ENGINE_CONFLICT_RESOLVER_H_
 #define SYNC_ENGINE_CONFLICT_RESOLVER_H_
-#pragma once
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 #include "sync/engine/syncer_types.h"
 
 namespace syncer {
@@ skipping 59 matching lines @@
                               const Cryptographer* cryptographer,
                               const sessions::ConflictProgress& progress,
                               sessions::StatusController* status);
 
   DISALLOW_COPY_AND_ASSIGN(ConflictResolver);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_ENGINE_CONFLICT_RESOLVER_H_