Re: [mediacapture-main] Clarify behavior of using wrong-type constraints

@martinthomson That or: wrong-domain - ignore.

The only thing that holds me back from `TypeError` is that in 
combination with `getSupportedConstraints` I could see it causing 
future breakage, like:

```js
let constraints;
if (navigator.mediaDevices.getSupportedConstraints().volume) {
  constraints.volume = { exact: 1};
}
let stream = await
    navigator.mediaDevices.getUserMedia({video: constraints, audio: 
constraints]);
```

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Received on Wednesday, 12 October 2016 12:06:50 UTC