Fix typo in InvertedDesktopFrame

BUG=279334
R=wez@chromium.org

Review URL: https://webrtc-codereview.appspot.com/2141004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4643 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed