[NS A27] Remove useless logs and a useless var

These logs haven't found a bug in a long time and we now have
some structural guarantees that the conditions they check for
can't happen (like the checks that everything is happening on
the same thread).
Maybe we'll reinstate similar checks later, but for now they
are in the way and removing them is a small sacrifice for the
intended benefit.

The local was simply not used any more.

Test: FrameworksNetTests
Change-Id: I4b793e86039c204a038c1b0fecbf8a4927eef48d