Fix SF unittest OWNERS for reviewing

Restore some SF owners to certain test files to make reviewability
easier.

Bug: none
Test: presubmit
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:bb008aaccf30ef62773214cdfcfabb43aa33b8b2)
Merged-In: Ibe820409564b8bc330eedc4bf60ea17a84d012a4
Change-Id: Ibe820409564b8bc330eedc4bf60ea17a84d012a4