According to Adam Schefter on the NFL Network, they haven't. He said it was the longest streak in the NFL.
The interesting part is that he said this while they were discussing SD @ KC and how LJ would do. And it's kind of weird, because I would swear that I remember the Chargers coming to KC in week 16 last year, and this same Larry Johnson guy they were talking about ran for 130 some yards that day.
Maybe I'm crazy?