Merge "Cleans up any stray instances of KeyguardUpdateMonitor that might still have listeners attached to system services." into tm-qpr-dev am: d5d35fb282 am: afc70ab788

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19967845

Change-Id: Ib7e5986da16cbfee5869bd00fffd590a79e925cd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>