UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.87 Safari/537.36

Steps to reproduce the problem:
1. Go to https://appr.tc/r/room-of-your-choice
2. Set a breakpoint at line 1 of apprtc.debug.js
3. Refresh
4. When you hit the breakpoint, run this code in the console:

(() => {
  const originalGetUserMedia = navigator.mediaDevices.getUserMedia.bind(navigator.mediaDevices);

  navigator.mediaDevices.getUserMedia = (constraints) => {
    console.log('intercepted constraints:', constraints);
    constraints.audio = { echoCancellation: false };
    console.log('new constraints:', constraints);
    return originalGetUserMedia(constraints);
  };
})();

5. Continue
6. Join the meeting
7. Have another person set this up in the same room and talk to them
8. Observe that no echo is occurring

What is the expected behavior?
You should be able to hear yourself as your voice comes out of the other person's speakers and into their microphone and back to you.

What went wrong?
Echo cancellation was not turned off.

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 56.0.2924.87  Channel: n/a
OS Version: OS X 10.12.2
Flash Version: Shockwave Flash 24.0 r0

I was able to get the expected echo by doing this in Firefox with the same setup.