Re: [mediacapture-fromelement] Define behavior when a cycle is detected (#85)

Thought: If we define that captureStream() produces a track that is initially muted, and that a HTMLMediaElement will unmute the output stream when data becomes available, and that data is not considered available when the srcObject is a muted stream, it all becomes quiet.
Of course, if the HTMLMediaElement has a preroll image set, people probably expect to see that on the output stream, which means that the issue returns in a different form.

I don't see the risk being great enough to warrant throwing an error, but consistency is good.

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