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This is a monitoring histogram and it's still useful.

Bug: 1149516
Change-Id: I3cc1968f502f06c8ab1e42bfb39e12f95b11d50c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2541608Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Jesse Doherty <jwd@chromium.org>
Auto-Submit: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828224}