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PlatformVerificationFlow::ChallengeCallback was previously unspecified
as to whether it was a base::OnceCallback or base::RepeatingCallback
(base::Callback aliases base::RepeatingCallback and should not be used).

Since it's really a base::OnceCallback, this CL changes it to be that
and adjusts the surrounding code appropriately.

Bug: 1007635
Change-Id: Idf531ef4e2048cc31ed4d6ce15559dd3543725f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321793Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Will Cassella <cassew@google.com>
Cr-Commit-Position: refs/heads/master@{#792735}