Remove audio data test

Originally noted in #721, the current test only checks for audio
elements on the window. This results in true in pretty much all
browsers. Audio data only exists in FF as a depricated API. The test is
currently broken. I created a new pull since the old one (#721) was old
and out of date.
Merge pull request #1019 from patrickkettner/audio-data-update

Remove audiodata test