Remove last pieces of libjingle_unittest
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-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#8548}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 24485eb3cc7e2729613d9fa413e476ef91977871

sippet/talk,sippet/talk,sippet/talk,sippet/talk,sippet/talk