Use strong pointer in ALooper to avoid use-after-free am: 7d712cfe6d am: 3eb9984044

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/hardware/interfaces/+/13209505

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I59995832c72b1b1e54c9b4aecb27b1ebf7dcc579