Delete tests looking for the audio attribute in <video> since it doesn't
exist
Restore old tests and check the non-existence of the audio attribute
move old-tests/submission/Google/video/audio tests to /html/semantics/embedded-content-0/media-elements
add another test on setting a value to video.audio
Merge pull request #369 from w3c/deniak/google-video-audio-attr

Delete tests looking for the audio attribute in <video> since it doesn't exist