GitLab

Create net::OnceCompletionCallback and use it in
AppCacheService::GetAllAppCacheInfo

TBR=jam@chromium.org

Bug: 714018
Change-Id: Ie134d99a7c54deb9ded852e3a817420f5ac59b93
Reviewed-on: https://chromium-review.googlesource.com/664844
Commit-Queue: Mark Pilgrim <pilgrim@chromium.org>
Reviewed-by: Michael Nordman <michaeln@chromium.org>
Cr-Commit-Position: refs/heads/master@{#502912}