I didn't know you could even use an out-of-date Chrome. I've been using it from a long time (soon after it was created), and IIRC, at some point, didn't they make updates automatic and mandatory? Or is there some setting in Chrome to toggle that? Haven't checked recently.

Update: Just now went to Chrome Settings and looked. Didn't see a toggle like that. And when I clicked on the About link, it 'checking for updates' and then 'updating Google Chrome'.