Merge "Preventing from double remove starting window after Activity destoryed"...

Merge "Preventing from double remove starting window after Activity destoryed" into udc-dev am: b9df9a61 am: 3047485e am: ecf7a0af

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/23657536



Change-Id: I268e4e872a474891c24c4b7ef9d431b957abfada
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>