Ack messages when WindowInfosListeners are removed am: 7da995f39e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/24907058

Change-Id: I872c93b708e9af5d68f97828daf4f19e65688d06
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>