Revert "[flexiglass] Stop consuming window inset in WindowRootView when flexiglass is on"

This reverts commit bb5fbe4563824555eef9a7f350dd0d810f28aba7.

Reason for revert: b/327379172

Change-Id: Iaf387c2bdc70bfd9e125445849c45550039874c1
Merged-In: Iaf387c2bdc70bfd9e125445849c45550039874c1
3 files changed