Refactor to match Mozilla’s Boilerplate

[kalaschnik]

See:

• https://webrtc.github.io/samples/
• https://github.com/webrtc/samples/blob/gh-pages/src/content/getusermedia/record/js/main.js

compare it also with: https://demo.videowhisper.com/cam-recorder-html5-video-audio/

[kalaschnik]

Or apples: https://webkit.org/blog/11353/mediarecorder-api/

[kalaschnik]

Even better: https://github.com/webrtc/samples/tree/gh-pages/src/content/getusermedia/record