Hollow out more of the tracing system in oilpan

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

Committed: https://chromium.googlesource.com/external/mojo/+/031be1415710de0872f6e7746e65e800b04a605c

[eseidel, 2014-10-27 21:45:55]

Committed patchset #1 (id:1) manually as
031be1415710de0872f6e7746e65e800b04a605c (presubmit successful).

[abarth-chromium, 2014-10-27 21:52:36]

lgtm