I integrated Breakpad into Firefox to replace the old closed-source Talkback implementation, we shipped it in Firefox 3. I suspect (but would have to ask Mark Mentovai to confirm) that Breakpad was probably written for use in the not-yet-publicly-announced Chrome. If so, that would mean that we shipped it first. :) I probably still have commit access to Breakpad, although I haven't contributed to it in years.
Now I know there's nice Rusty work happening with this stuff that I could maybe make use of for my next employer or a personal project. Neat.