Remove openglui embedder code

Remove openglui embedder code

This code has rotted.  We should eventually fix and land outside the Dart repo.

I've verified that

> ./tools/build.py -m release --os=android

still builds (with target_os=android in .gclient).

R=zra@google.com

Committed: https://code.google.com/p/dart/source/detail?r=28018

[zra, 2013-09-27 16:38:14]

lgtm

[vsm, 2013-09-27 17:01:37]

Committed patchset #1 manually as r28018 (presubmit successful).