GitLab

Expire unused histograms.

Adds expires_after attribute for 213 histograms that do not show
any access in the past 30 days.

Change-Id: I253f523a231690a6fb04cbb31411cee0da6b457f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835675
Commit-Queue: Brian White <bcwhite@google.com>
Commit-Queue: Brian White <bcwhite@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702105}