UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36

Steps to reproduce the problem:
1. Create an html document in web
2. Write a script tag
3. Paste the code below into script tags
4. console.log(navigator.requestMediaKeySystemAccess)
5. View it in https and http connections and compare the result

What is the expected behavior?
The browser should write 

function requestMediaKeySystemAccess() { [native code] }

to the console

What went wrong?
The console output is undefined

Did this work before? No 

Chrome version: 59.0.3071.115  Channel: stable
OS Version: 10.0
Flash Version: 

You can try this bin in chrome;

<a href="http://jsbin.com/getucuyowi/edit?html,js,output">http://jsbin.com/getucuyowi/edit?html,js,output</a>