Revert r5937 "Fix multi-monitor support in the screen capturer for Mac."

This would break when rolled in chromium because some code in
chromium depends on the code I changed in that change.

TBR=jiayl@webrtc.org
BUG=361919

Review URL: https://webrtc-codereview.appspot.com/12199005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5940 4adac7df-926f-26a2-2b94-8c16560cd09d
5 files changed