Reviewed by David Kilzer.

        Stale database version persists through browser refresh (changeVersion doesn't work)
        https://bugs.webkit.org/show_bug.cgi?id=27836

        Scale the cairo surface of the video sink depending on the
        pixel-aspect-ratio of the video buffer to paint. Also
        destruct/re-create the surface when setSize() is called with a new
        size.

        * platform/graphics/gtk/MediaPlayerPrivateGStreamer.cpp:
        (WebCore::MediaPlayerPrivate::naturalSize):
        (WebCore::MediaPlayerPrivate::setSize):
        (WebCore::MediaPlayerPrivate::paint):
        * platform/graphics/gtk/VideoSinkGStreamer.cpp:
        (webkit_video_sink_idle_func):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@49019 268f45cc-cd09-0410-ab3c-d52691b4dbfc