mac: Mark kCGLPFAFullScreen as allowed in a 10.6-only function.
mac: Mark kCGLPFAFullScreen as allowed in a 10.6-only function.

kCGLPFAFullScreen is marked deprecated starting with 10.6 in the 10.9 SDK,
but it's functional on 10.6 and this code only runs on 10.6 and will go away
when support for 10.6 is dropped.

BUG=webrtc:1958
R=sergeyu@chromium.org

Review URL: https://webrtc-codereview.appspot.com/1710004

Patch from Nico Weber <thakis@chromium.org>.

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 3348ae2b97f7f14de7dcf911bfd3e8c571d7174a

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