Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/app_sync_data.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 CHROME_BROWSER_EXTENSIONS_APP_SYNC_DATA_H_
 #define CHROME_BROWSER_EXTENSIONS_APP_SYNC_DATA_H_
-#pragma once
 
 #include "chrome/browser/extensions/extension_sync_data.h"
 #include "chrome/common/string_ordinal.h"
 #include "sync/api/sync_change.h"
 
 namespace syncer {
 class SyncData;
 }
 
 namespace sync_pb {
@@ skipping 60 matching lines @@
   ExtensionSyncData extension_sync_data_;
   std::string notifications_client_id_;
   bool notifications_disabled_;
   StringOrdinal app_launch_ordinal_;
   StringOrdinal page_ordinal_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_APP_SYNC_DATA_H_