GitLab

Use OnceCallback where possible, and BindRepeating where it is meant to
be called more than once.

TBR=sky@chromium.org, dpranke

Bug: 953861
Change-Id: Ie70184db86a0fa19af7b3f2de67867d46e23a523
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1934775
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719182}