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Delay expiry of frequently used histograms.

Updates the expires_after attribute for 174 histograms that show
frequent access in the past 90 days.  These are the 90% most
frequently used histograms over that time that do not already have a date later
than or within 60 days of 2020-10-04.

TBR=bcwhite@chromium.org

Change-Id: I83f6f1e216746f4e25b0e07b312e5fc724674025
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2140271Reviewed-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@{#757167}