[mediacapture-main] The devicechange event should not fire for changes of a device kind that cannot be used for a given browsing context (#692)

youennf has just created a new issue for https://github.com/w3c/mediacapture-main:

== The devicechange event should not fire for changes of a device kind that cannot be used for a given browsing context ==
If feature policy is preventing camera access, we should not fire devicechange events when user is plugging in a camera.
This should be enforced both before and after gum approval

Please view or discuss this issue at https://github.com/w3c/mediacapture-main/issues/692 using your GitHub account