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These histograms have been unused for a while and are expiring so this
change removes them instead of extending their expiration.

Bug: 1160737
Change-Id: I757a067e33d7172be10a80b011123fa17d4658a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2613510Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Commit-Queue: Brandon Tolsch <btolsch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841091}