[gold] Roll back gold-frontend changes to blame logic.
[gold] Roll back gold-frontend changes to blame logic.

I'm currently working on fixing a bug in the new blame logic (WIP CL: https://skia-review.googlesource.com/c/buildbot/+/536442). I've temporarily rolled back my changes. This CL's purpose is to prevent alerts on https://am.skia.org due to stale images running in production.

Bug: skia:13196
Change-Id: Icebb1e6256514492b6c2a374ed63e363fbd24125
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/538958
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Auto-Submit: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>
Commit-Queue: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot