LSan suppressions for libjingle tests.

Adding a few more suppressions to make the tests pass
LSan as it's about to be enabled in the main waterfall
at the ASan bot.

TBR=wu@webrtc.org
BUG=2528, 3345
TEST=None, since I cannot reproduce the leaks on the bot
in my local environment (and we don't have a trybot for this yet).

Review URL: https://webrtc-codereview.appspot.com/18429006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6153 4adac7df-926f-26a2-2b94-8c16560cd09d