Make ScreenCapturerMac work in versions of OSX before Lion.

The screen capturer was broken when moving code to webrtc: width
and height parameters for glReadPixels were swapped by mistkake.

BUG=crbug.com/244102
R=alexeypa@chromium.org

Review URL: https://webrtc-codereview.appspot.com/1678005

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4239 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed