UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36

Steps to reproduce the problem:
1. Go to any website (stackoverflow.com for example)
2. Open Developer console
3. Execute the following:
var xhr2 = new XMLHttpRequest();
xhr2.upload.onprogress = function() {};
var data = new FormData();
var target = "http://gengo.com/";
var method = "POST";
xhr2.open(method, target, true);
xhr2.send(data);
4. Check the sent Headers of the request in the Network tab

What is the expected behavior?
The Access-Control-Request-Headers header should not be included as it's empty.

What went wrong?
The Access-Control-Request-Headers header is included and empty.

Did this work before? N/A 

Chrome version: 52.0.2743.116  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 22.0 r0