GitLab

Consolidate the cache readiness hook implementations in the base class
because all the implementations ended up the same.

Bug: 1043306
Change-Id: I814c4eb4ca464247336f263ba98af1a1dfd39d7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422352
Commit-Queue: Olivier Yiptong <oyiptong@chromium.org>
Reviewed-by: Joshua Bell <jsbell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809499}