1. Change the option from Clear all to Clear all Download History
2. Change the wording from delete to clear
from "Are you sure you want to *delete* all of your download history?
to "Are you sure you want to clear all of your download history?
Change pop-up button from [delete] to [clear]
The word delete in downloads might be mistaken to mean delete actual downloads.
3. Add a new option - Clear all Download History (without prompt)