Address some IDE warnings in ConnectivityService

Unused arguments, non-final members, unannotated members, typos.
This doesn't try to remove all warnings, but just opportunistically
fixes some.

Bug: 238139913
Test: ConnectivityServiceTest
Change-Id: Ia5e905a0244cfb5f72c06d0c0be3458c42b27a52
1 file changed