Revert "Call preserveSurfaces when detaching children."

This reverts commit 9118c9b573a743a1526beb7a0de48174ee561af2.

Reason for revert: b/161316231

Bug: 161316231
Test: Steps from bug
Change-Id: Ieb76c99d96eb7f261a1bd2680ebf83905c2a5369
1 file changed