Remove unused code.
Remove unused code.

Breuls/concurrent-spider-bundle,keesschepers/concurrent-spider-bundle,Breuls/concurrent-spider-bundle,lkalinka/concurrent-spider-bundle,lkalinka/concurrent-spider-bundle,Breuls/concurrent-spider-bundle,keesschepers/concurrent-spider-bundle,keesschepers/concurrent-spider-bundle,lkalinka/concurrent-spider-bundle