This is all done (see the dependencies) except for completing an example. That is largely done but needs to be finished up and added to the page; that should happen tomorrow or so.
I now have a nice example that shows lists of available video and audio devices on https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/ondevicechange; this is linked to from the devicechange page as well. The example also demonstrates how to determine whether a device is audio or video, or input or output, using a regexp to break up the kind string into type and direction values. With the example, and the work done on the dependencies, this is now documentation complete.
All dependent bugs seem fixed. Anything else needed here, or can this be closed as done?