Remove dead code in ports/.

Remove dead code in ports/.

These files are not referenced by any .gyp file in Skia or Chromium.
ninja -C out/Debug everything still builds.

BUG=skia:

Committed: http://code.google.com/p/skia/source/detail?r=14036

[bungeman-skia, 2014-04-02 20:18:57]

I have a CL out there that I haven't had time to work on,
https://codereview.chromium.org/23137018/ , which uses the expat one. This is
somewhat awkward as there are bits of animator which use these, and those are in
some sense 'dead' too. In other words, I have no issue with the harfbuzz one,
but I don't think I'm the one to ask about the others. Maybe Cary or Mike.

[mtklein, 2014-04-02 20:29:32]

Hal's feeling brave!

[hal.canary, 2014-04-02 20:30:27]

lgtm

[mtklein, 2014-04-02 20:30:48]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-04-02 20:30:51]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/214243004/1

[commit-bot: I haz the power, 2014-04-02 22:03:24]

Change committed as 14036