Revert "Remove getSfInstance usage from ViewRootImpl"

This reverts commit a825a5c0d9c166dc6a6badc8c7fdd617c9c00d0b.

Reason for revert: regression as b/228282275

Bug: 222696368
Bug: 228282275
Change-Id: Iba99b5a9ab53a829ce4928cccc47293e62f76162
8 files changed