Remove libjingle_root GYP variable

It is no longer needed.

R=andrew@webrtc.org, perkj@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/44449004

Cr-Commit-Position: refs/heads/master@{#8627}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8627 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed