Add kjellander as PRESUBMIT.py OWNER

BUG=
R=niklas.enbom@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/31949005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@7618 4adac7df-926f-26a2-2b94-8c16560cd09d