Merge "Destroy the last embedded activity immediately" into tm-dev am: 5f99fcc0 am: 7efeba7d am: 34860c3f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18231723



Change-Id: I4ea956c9038d0a9dc9ffe4da15b794796557b5af
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>