Fix MouseCursorMonitorMac to return correct hotspot position.

Previusly (0, 0) was always return as mouse cursor hotspot.

BUG=2779
R=wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/7089004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5379 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed