Re: [mediacapture-image] Use partial MediaStreamTrack instead of separate ImageCapture interface

`ImageCapture` still needs to be constructed and still needs to hold on to the source video `MediaStreamTrack`; #146/#150 moved many [non-photo-specific fields](https://w3c.github.io/mediacapture-image/#mediatracksupportedconstraints-section) from ImageCapture to the MediaStreamTrack, essentially applying the criteria of if it has an immediately visible effect, but we still had some [photo specific fields](https://w3c.github.io/mediacapture-image/##photocapabilities-section) that couldn't be migrated.

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Received on Tuesday, 21 March 2017 17:31:35 UTC