title: navigator.mediaDevices.getUserMedia NotFoundError in Linux
body: <h2>Versions affected</h2>
  
  <p>Chromium 60.0.3112.89 (Developer Build) Built on Ubuntu 14.04, running on Raspbian 9.4 (32-bit)
  and adapter.js v6.3.2</p>
  
  <h2>Description</h2>
  
  <p>When trying getUserMedia() I get this NotFoundError but it works fine if I use Firefox.
  If I use enumerateDevices I can see a list of mediaDevices like: 
  <code>
  MediaDeviceInfo {deviceId: "XXX", kind: "videoinput", label: "mmal service 16.1", groupId: ""}
  </code>
  So seems related with the chrome not recognizing the camera driver.</p>
  
  <h2>Steps to reproduce</h2>
  
  <p>Just trying to run the basic get user media demo: <a href="https://webrtc.github.io/samples/src/content/getusermedia/gum/" rel="nofollow noreferrer">https://webrtc.github.io/samples/src/content/getusermedia/gum/</a></p>
  
  <p>I believe that <em>This issue not only happens when adapter.js is used</em> but I would appreciate some guidance here!</p>
  
  <p>Thanks!</p>