Revert "Introduce Windowless starting window."

This reverts commit 8efcfd661087dbff6f8b5f455a87277870bc7d6d.

Reason for revert: b/270629751

Bug: 270629751
Change-Id: I901c7a0d18cf5e89f17d1c9dfdd42ac1644dc30f
22 files changed