Figured it out. The files in question didn't exist per se, but they did exist in a form: they had been compiled into *.map
files: bootstrap.css.map
and bootstrap-theme.css.map
. Deleting the *.map
files removes the zombie *.less
files from Chrome Dev Tools. Yay for magic files that get out of sync with the codebase.
See this answer for an explanation of the purpose of *.map
files.