Merge "Delay deleting the blob after the last lease is released." into rvc-dev am: a019160b am: 8b8132c5 am: c438ad90 am: ab55d6c8

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

Change-Id: I3dd970415ab629e5f77868dfa9e55c9c2da79d4c