Remove #pragma once from sync

sync/internal_api/public/util/unrecoverable_error_info.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_UTIL_UNRECOVERABLE_ERROR_INFO_H_
 #define SYNC_UTIL_UNRECOVERABLE_ERROR_INFO_H_
 // TODO(lipalani): Figure out the right location for this class so it is
 // accessible outside of sync engine as well.
-#pragma once
 
 #include <string>
 
 #include "base/location.h"
 
 namespace syncer {
 
 class UnrecoverableErrorInfo {
  public:
   UnrecoverableErrorInfo();
@@ skipping 12 matching lines @@
 
  private:
   tracked_objects::Location location_;
   std::string message_;
   bool is_set_;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_UTIL_UNRECOVERABLE_ERROR_INFO_H_