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Also add necessary doc header to ../logging.h.

Change-Id: I0ce55ea6804296e8bb1b66f47b91bbb16e1f198a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364578Reviewed-by: Josh Nohle <nohle@chromium.org>
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800210}