GitLab

This changes the callback from RepeatingCallback to OnceCallback,
and removes the nested callback which was unnecessary and made the code
hard to understand.

Bug: 1041472
Change-Id: If93482c0cfa9e676a0b35712bf545d33b60ada89
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094987Reviewed-by: Monica Basta <msalama@chromium.org>
Commit-Queue: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748649}