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The code that logged to these histograms was deleted in 2017, but I forgot
to mark them as obsolete in histograms.xml.

Change-Id: Idbca14571c01f0c81a76478d8967dd7f18bb61c4
Bug: 736978
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1802709
Auto-Submit: Nick Harper <nharper@chromium.org>
Commit-Queue: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696971}