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

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



Change-Id: I2655009c8a6cc011cf9c5f40955d1bceefa8d717
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>