Rebase webrtc/base 6129:6163 (svn diff -r 6129:6163 http://webrtc.googlecode.com/svn/trunk/talk/base apply diff manually)

BUG=N/A
R=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/15519004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6175 4adac7df-926f-26a2-2b94-8c16560cd09d