[importer] Remove unused method forwarding in Downloader
[importer] Remove unused method forwarding in Downloader

UCL-ShippingGroup/cartodb-1,future-analytics/cartodb,thorncp/cartodb,DigitalCoder/cartodb,DigitalCoder/cartodb,dbirchak/cartodb,DigitalCoder/cartodb,CartoDB/cartodb,codeandtheory/cartodb,bloomberg/cartodb,nyimbi/cartodb,dbirchak/cartodb,splashblot/dronedb,nuxcode/cartodb,CartoDB/cartodb,splashblot/dronedb,splashblot/dronedb,future-analytics/cartodb,splashblot/dronedb,thorncp/cartodb,raquel-ucl/cartodb,bloomberg/cartodb,raquel-ucl/cartodb,nyimbi/cartodb,CartoDB/cartodb,DigitalCoder/cartodb,UCL-ShippingGroup/cartodb-1,dbirchak/cartodb,UCL-ShippingGroup/cartodb-1,splashblot/dronedb,CartoDB/cartodb,raquel-ucl/cartodb,raquel-ucl/cartodb,future-analytics/cartodb,future-analytics/cartodb,DigitalCoder/cartodb,codeandtheory/cartodb,nyimbi/cartodb,codeandtheory/cartodb,nuxcode/cartodb,thorncp/cartodb,dbirchak/cartodb,UCL-ShippingGroup/cartodb-1,nuxcode/cartodb,dbirchak/cartodb,CartoDB/cartodb,nyimbi/cartodb,future-analytics/cartodb,thorncp/cartodb,thorncp/cartodb,codeandtheory/cartodb,nuxcode/cartodb,UCL-ShippingGroup/cartodb-1,bloomberg/cartodb,bloomberg/cartodb,nyimbi/cartodb,codeandtheory/cartodb,raquel-ucl/cartodb,nuxcode/cartodb,bloomberg/cartodb