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This is a follow-up on a comment in crrev.com/c/2463051. In
nss_context.cc we make GetNSSCertDatabaseForProfile take OnceCallback
instead of RepeatingCallback. This is possible, because the callback
will be used only once in GetCertDBOnIOThread. We then make all
callers use base::BindOnce.

BUG=764795
TESTED=build

Change-Id: I9120f3c4d0ff70be2dc6c146295a40cc4db17bb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2484069Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Matt Mueller <mattm@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Carlos IL <carlosil@chromium.org>
Reviewed-by: Hidehiko Abe <hidehiko@chromium.org>
Commit-Queue: Tomasz Tylenda <ttylenda@chromium.org>
Cr-Commit-Position: refs/heads/master@{#819690}