GitLab

These callbacks are only called from PostDelayedTask which calls them
once. They're always reset to a new callback before posting a new task.

Bug: 1152268
Change-Id: I5a04f6227d963982ad2f368eb9d9591668e49f35
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600031Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: David Bokan <bokan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#839120}