Test HTMLMediaElement canPlayType() method with multiple video mpeg4 MIME types.

These tests may be expected to fail if the WebKit port does not support the format.

EXPECTED (video.canPlayType('video/x-m4v') == 'maybe') OK
EXPECTED (video.canPlayType('video/mp4') == 'maybe') OK
EXPECTED (video.canPlayType('video/mp4; Codecs="avc1.4D400C"') == 'probably') OK
EXPECTED (video.canPlayType(' Video/MP4 ; CODECS="mp4v.20.8, mp4a.40.2"') == 'probably') OK
END OF TEST

