Correct - this service is not part of 9.0. It will be uninstalled when you upgrade. The new services that handle the functionality of the old OrionCustomPollingService.exe are:
display name/service name/executable
SolarWinds Job Engine/SWJobEngineSvc/SWJobEngineSvc.exe
SolarWinds Job Scheduler/SWJobSchedulerSvc/SWJobSchedulerSvc.exe
SolarWinds Orion Module Engine/OrionModuleEngine/SolarWinds.BusinessLayerHost.exe
Looks like those 3 were covered before.
Appreciate your help.