Increment sync_chromium.py version to force re-sync

This should make the remaining red Windows bots cycle green.
Currently, some of them are in a bad state for the Chromium
checkout.

BUG=webrtc:2863
TBR=niklas.enbom@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/18229004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6953 4adac7df-926f-26a2-2b94-8c16560cd09d