Hollow out more of the tracing system in oilpan

The goal here was to delete all the oilpan
conversion types and then as well all the calls
into trace().  In the process of attempting
to get it compiling I removed some trace()
calls from the font system before finding the
one stray trace() call I had missed in handle
causing the link errors.

TBR=abarth@chromium.org

Review URL: https://codereview.chromium.org/679113005