Merge "Delay deleting the blob after the last lease is released." into rvc-dev am: a019160b am: 8b8132c5 am: c438ad90

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11936459

Change-Id: If6ec771af18919a98528105851cdeccfaa60197f