Remove unneeded includes from trace_posix.cc.

TESTED=trybots
R=niklas.enbom@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/3629004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5103 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed