Revert "Fixup app-private dirs that are not writable."

This reverts commit 13f793ae.

Reason for revert: Breaks device health checks; crashes if dir is null.

Bug: 181726193
Bug: 182088154

Fixes: 186633787
Change-Id: Ia28df79c6ff4aacd6bdadf1d9c540f49dcace707