I'm not sure which info is prudent to provide here. Chromium has been a bit crash-happy in general lately, but this is the first instance I've seen of the host crashing, and it's reliably reproducible. The site http://phoboslab.org/xibalba/ will trigger it, and presumably any others which use the features it is leveraging. Reports from Windows and Linux users suggest this problem is not present on those platforms. Chromium version 46.0.2490.86 from pkgng, FreeBSD 10.2-RELEASE-p7, amd64.
10.2 is EOL and we have version 61.0.3163.100. I think it is overcome by events.