Merge "Purge proto tombstones when apps are uninstalled." am: a139d7cbde am: 254b54464d

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1566719

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I677b83a320614f87d6fbbb014413bdbab2898ce0