Bug#979590: libx11-xcb1: Updating to 1.7.0-1 from 1.6.12-1 breaks chromium and google chrome

[Christoph Berg <myon@debian.org>]

Re: Faidon Liambotis
> It turned out that for me, the cause was a disparity between libx11-xcb1
> and libx11-6 -- the former was at 2:1.7.0-1, while the latter was at
> 2:1.6.12-1 (don't ask why...).

I had the same here on testing+unstable (the latter on lower pin
priority), and upgrading libx11-6 fixed the problem.

chromium depends on libx11-6 (>= 2:1.4.99.1), libx11-xcb1 (>= 2:1.7.0)
which explains why only libx11-xcb1 got pulled from unstable.

Christoph