Yep, I agree you certainly did change (all) the .dep files.
I hope my comments are not too much a nuisance.
And to continue with my habit of making those comments: Whilst the loop you did is working fine you could also do things with the 'xargs' command (e.g.
ls | grep '\.dep$' | xargs grep -l nss-nspr). This has the advantage that no
globbing (i.e. "*.dep") is used which can cause problems if the shell can't handle super-long commands. I've burned my fingers on a Solaris production system once and I'm therefore a bit "super-careful". If the shell is playing along
grep -l nss-nspr *.dep is obviously even fewer keystrokes, but that comes with the risk that the command gets too long. BTW that risk does not get eliminated by globbing in a back-ticked expression.
But as always: TMTOWTDI (as they say in the "Perl world").