Merge "Revert "Introduce Windowless starting window."" into udc-dev am: f515de95 am: cfe54652

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21590159



Change-Id: If511490fe5c7e64de3e56d3661c4606d1b63b546
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>