title: reset chrome media engagement score
body: <p>I know that Chrome 66 introduced some restrictions when autoplaying a video (in HTML5). 
  In some cases the autoplay is supported. One of the conditions to support autoplay is when the user has watched a video in the domain before or something similar.  So Chrome is keeping an internal score for each site. This score can be checked in chrome://media-engagement. </p>
  
  <p>But now my problem is that for testing I have not figured it out a simple way to reset this score. So I can not properly test it for the new users.</p>
  
  <p>Any idea?</p>