Revert "ViewRootImpl: Fix child lifetime."

This reverts commit ba29dbc3b38d9efb743d6fa7f9f8c4bb75c38b28.

The original commit causes apps such as phone and clock to not wake the
device.

Fixes: 37197491
Change-Id: I1b45cafbcbf12991d8e1e716e4d1751cd077c556
2 files changed