Re: [mediacapture-record] isTypeSupported() algorithm should be more specific

The spec should similarly more clearly define how implementations 
should process `MediaRecorderOptions`'s 
[`mimeType`](https://w3c.github.io/mediacapture-record/MediaRecorder.html#dom-mediarecorderoptions-mimetype)
 attribute. Perhaps they can share an algorithm.

FWIW, EME uses `contentType` to avoid ambiguity with a simple MIME 
type, such as `"video/mp4"`.

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Received on Monday, 21 November 2016 23:30:37 UTC