This will happen for all Pinpoint jobs on Chromium revisions before April 27. The fixes were on the Chromium side, so the failure will be in the revision history forever. See  https://crbug.com/836037#c26  for additional context. Postmortem is forthcoming next week.

Workaround is to run the job with a patch applied:
https://chromium-review.googlesource.com/c/chromium/src/+/1091990
I'll do that now for the above job.

Actually, sorry, I just ran the job but realized that it may give incorrect results due to https://bugs.chromium.org/p/chromium/issues/detail?id=850812.