Cache Storage: BindOnce-ify CacheManager::GetAllOriginsUsage

Switch a few Cache Storage-related code paths from generic
Bind/Callback to BindOnce/OnceCallback.

Bug: 714018
Change-Id: I245cb56090228865cb0f4957caf8f704568eac39
Reviewed-on: https://chromium-review.googlesource.com/c/1289433
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602357}
7 files changed