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Updates the expires_after attribute for 42 histograms that have
been used to generate alerts in the past 90 days and do not already have
a date later than or within 60 days of 2020-10-18.

TBR=bcwhite@chromium.org

Change-Id: If1fecdced75154299051b8a4a4243980b578a374
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2157054Reviewed-by: Chrome Metrics Logs <chrome-metrics-team+robot@google.com>
Commit-Queue: Chrome Metrics Logs <chrome-metrics-team+robot@google.com>
Cr-Commit-Position: refs/heads/master@{#761050}