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This histogram is still used by the profile metrics dashboard.

Fixed: 1121217
Change-Id: I82caf8e4c2afc738ca189ffcb57e4316e73afcb6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587033
Auto-Submit: David Roger <droger@chromium.org>
Reviewed-by: Alex Ilin <alexilin@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836748}