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And instead make function public.
I did not move the definition, because, as far as I can tell, the
declarations/definitions are rather out of sync for this file.

BUG=none
TEST=none

Change-Id: Ie0b21ffdf14513e1e67c4d1d0dce70703745387f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1505838
Commit-Queue: Scott Violet <sky@chromium.org>
Auto-Submit: Scott Violet <sky@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638290}