Removing stubborn Safari 7 autocomplete entries. tl;dr: If deleting the history entry fails to remove a stubborn autocomplete entry, go to:
Open it with Xcode, and delete anything with the offending entry. Done!
Sorry for the lack of edits, I lost access to Premiere and I'm upset at iMovie for its lack of 1440p60 export, so this was hacked together in Quicktime, ffmpeg and Handbrake in half an hour including recording(!). I'm capable of better videos, I promise. Maybe. Only one way to find out.
Tested in: Safari 7.1, OS X 10.9.5
Tags: Removing stubborn Safari 7 autocomplete entries