Reviewed by Darin.

        Fix <rdar://problem/5929010> Adopt new QTKit methods for <video> implementation

        If the class QTVideoRendererWebKitOnly is present use it to render video,
        otherwise fall back to existing use of QTMovieView/QTMovieContentView.

        * platform/graphics/mac/MediaPlayerPrivateQTKit.h:
        * platform/graphics/mac/MediaPlayerPrivateQTKit.mm:
        (WebCore::MediaPlayerPrivate::~MediaPlayerPrivate):
        (WebCore::MediaPlayerPrivate::createQTMovie):
        (WebCore::QTVideoRendererClass):
        (WebCore::MediaPlayerPrivate::detachQTMovieView):
        (WebCore::MediaPlayerPrivate::createQTVideoRenderer):
        (WebCore::MediaPlayerPrivate::destroyQTVideoRenderer):
        (WebCore::MediaPlayerPrivate::setUpVideoRendering):
        (WebCore::MediaPlayerPrivate::tearDownVideoRendering):
        (WebCore::MediaPlayerPrivate::load):
        (WebCore::MediaPlayerPrivate::cancelLoad):
        (WebCore::MediaPlayerPrivate::setVisible):
        (WebCore::MediaPlayerPrivate::paint):
        (-[WebCoreMovieObserver newImageAvailable:]):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@33948 268f45cc-cd09-0410-ab3c-d52691b4dbfc