Allow iOS port to use InbandTextTrackPrivateAVF
https://bugs.webkit.org/show_bug.cgi?id=111933

Reviewed by Dean Jackson.

* platform/graphics/avfoundation/InbandTextTrackPrivateAVF.cpp:
(WebCore::InbandTextTrackPrivateAVF::processCue): Drive-by cleanup.
* platform/graphics/avfoundation/InbandTextTrackPrivateAVF.h:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145326 268f45cc-cd09-0410-ab3c-d52691b4dbfc