Track API changes TimeZoneDetector -> TimeManager

Methods were moved from TimeZoneDetector to TimeManager in commit
02d943f44d4ed11a7cde1fa33a4c0c07b9cb7e3c. This commit updates comments
to track.

Bug: 159891384
Test: None - comment change
Change-Id: I96c4c248f98041f88ff3372b575114c277b80620
1 file changed