Please read the original thread. This was already reported as: https://code.google.com/p/chromium/issues/detail?id=491435

I did, the ticket you linked has been closed with 'adding a opt-out flag' as solution. I opened another one to discuss it's behaviour in general, wether it should be:

1) opted-in by default

2) not ask user for permission (or notify him in any way)

3) hide the extension from the extension list

4) record audio without permission