Update Chromium sync scripts for WebRTC r7222 changes

https://code.google.com/p/webrtc/source/detail?r=7222 contains
a few fixes for edge cases when moving back and forth with
Chromium DEPS.

TBR=fbarchard@google.com
BUG=

Review URL: https://webrtc-codereview.appspot.com/30529004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@1090 16f28f9a-4ce2-e073-06de-1de4eb20be90
2 files changed