Fix Windows build.  %zu isn't supported in the crt implementation

we use there, so it just crashes.
Review URL: http://webrtc-codereview.appspot.com/213001

git-svn-id: http://webrtc.googlecode.com/svn/trunk@712 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed