Deprecate Media.Audio.Render.BrowserCallbackRegularity.* histograms.

Bug: None
Change-Id: I06204797a82a44083b04b9c6a221f784d7312c50
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1672863
Reviewed-by: Olga Sharonova <olka@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Henrik Grunell <grunell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672820}
2 files changed