Uma link:
https://uma.googleplex.com/timeline_v2/?sid=d49c65c7e963f7298e37b92f5f3e659e

Here's the changelog:
https://chromium.googlesource.com/chromium/src/+log/61.0.3163.59..61.0.3163.71?pretty=fuller&n=10000

This bug affects dev and canary and beta all at the same time, so it's almost certainly a change in some large site, marking as wontfix.