Remove #pragma once from sync

sync/internal_api/public/configure_reason.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_INTERNAL_API_PUBLIC_CONFIGURE_REASON_H_
 #define SYNC_INTERNAL_API_PUBLIC_CONFIGURE_REASON_H_
-#pragma once
 
 namespace syncer {
 
 // Note: This should confirm with the enums in sync.proto for
 // GetUpdatesCallerInfo. They will have 1:1 mapping but this will only map
 // to a subset of the GetUpdatesCallerInfo enum values.
 enum ConfigureReason {
   // We should never be here during actual configure. This is for setting
   // default values.
   CONFIGURE_REASON_UNKNOWN,
 
   // The client is configuring because the user opted to sync a different set
   // of datatypes.
   CONFIGURE_REASON_RECONFIGURATION,
 
   // The client is configuring because the client is being asked to migrate.
   CONFIGURE_REASON_MIGRATION,
 
   // Setting up sync performs an initial config to download NIGORI data, and
   // also a config to download initial data once the user selects types.
   CONFIGURE_REASON_NEW_CLIENT,
 
   // A new datatype is enabled for syncing due to a client upgrade.
   CONFIGURE_REASON_NEWLY_ENABLED_DATA_TYPE,
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_CONFIGURE_REASON_H_