Update to 10.0.648.204, which is the latest release from the Stable series.
There are still some problems with it on 8.X (and presumably 7.X), see
pkg-message for a possible workaround.
This would not have been possible without:
- portmgr@ for drawing me into this in October last year
- beat@ for providing a development repository
- dhw@ for creating the freebsd-chromium list
- all the patch contributors and testers on the freebsd-chromium list