GitLab

Adds expires_after attribute for 345 histograms that do not show
any access in the past 120 days.

Change-Id: If6a91f200567228dffc6694bbaf8e2423d116b31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1716032Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#680495}