Remove last pieces of libjingle_unittest

Most of this code has been moved into rtc_unittests
a long time ago. The target is no longer executing on the bots.

BUG=
R=perkj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/39319004

Cr-Commit-Position: refs/heads/master@{#8548}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8548 4adac7df-926f-26a2-2b94-8c16560cd09d
4 files changed