Revert "(Auto)update libjingle 71675033-> 71726409"

This reverts commit r6761 which looks like an accidental auto-revert of
r6760.

BUG=1788
TBR=wu@webrtc.org, henrike@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/18009004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6763 4adac7df-926f-26a2-2b94-8c16560cd09d