Remove expired histograms DomainMixing.OneDay, DomainMixing.OneMonth,...

Remove expired histograms DomainMixing.OneDay, DomainMixing.OneMonth, DomainMixing.OneWeek, DomainMixing.TwoWeeks

It looks like without these histograms (not recorded since M85) this
enture codepath is dead.

Bug: 1384679
Change-Id: I51f7c866e171169ec52e5bb8c4a633b3ffeb5e1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4298781


Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Benoit Lize <lizeb@chromium.org>
Reviewed-by: Benoit Lize <lizeb@chromium.org>
Auto-Submit: Ari Chivukula <arichiv@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1112865}