resourcemanager: refactor death notification am: f9137e4169 am: 16f84c5967

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/23783756

Change-Id: I3b429c40354202de6bafa5b0707c8a3063a76cbe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>