Make sure MediaError.message does not aid to fingerprinting
MediaError got a new property message that might contain system information, see: https://bugzilla.mozilla.org/show_bug.cgi?id=1322606 and https://github.com/mdn/dom-examples/blob/master/media/mediaerror/main.js.
We should find out whether that's the case and if so probably just remove that part.
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