UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/56.0.2924.76 Chrome/56.0.2924.76 Safari/537.36

Steps to reproduce the problem:
1. Run Chromium in headless mode (~/chrome-linux/chrome --headless --disable-gpu --no-sandbox --remote-debugging-port=9222)
2. Navigate to http://localhost:9222 in non-headless browser and click to 'about:blank' link (observe - "chrome-devtools-frontend.appspot.com" opened)
3. In opened app enter http://goga.pro and press 'refresh' button near textbox

What is the expected behavior?
Site from step 3 should be rendered in "chrome-devtools-frontend.appspot.com" after some time.

What went wrong?
Nothing happens. 
After some time "Tab is inactive" message appears.

Also please note that everything works fine in same Chromium binary without headless flag.

When i'm trying to navigate to same site with Chrome Debugging Protocol (e.g. websocket based API) i can observe that no events are triggered after first 'Network.requestWillBeSent'.

Here is websocket session dump:
>| {"method":"Page.enable","id":1}
<| {"id":1,"result":{}}
>| {"method":"Network.enable","id":2}
<| {"id":2,"result":{}}
>| {"method":"Console.enable","id":3}
<| {"id":3,"result":{}}
>| {"params":{"userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36"},"method":"Network.setUserAgentOverride","id":4}
<| {"id":4,"result":{}}
>| {"params":{"headers":{"Accept-Language":"ru-RU"}},"method":"Network.setExtraHTTPHeaders","id":5}
<| {"id":5,"result":{}}
>| {"params":{"url":"https://goga.pro/"},"method":"Page.navigate","id":6}
<| {"method":"Page.frameStartedLoading","params":{"frameId":"9076.1"}}
<| {"method":"Network.requestWillBeSent","params":{"requestId":"9076.1","frameId":"9076.1","loaderId":"9076.1","documentURL":"https://goga.pro/","request":{"url":"https://goga.pro/","method":"GET","headers":{"Accept-Language":"ru-RU","Upgrade-Insecure-Requests":"1","User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36"},"mixedContentType":"none","initialPriority":"VeryHigh","referrerPolicy":"no-referrer-when-downgrade"},"timestamp":1465848.184602,"wallTime":1489651688.04825,"initiator":{"type":"other"},"type":"Document"}}
<| {"id":6,"result":{"frameId":"9076.1"}}

... the end, no further messages...

Did this work before? N/A 

Chrome version: 59.0.3044.0  Channel: n/a
OS Version: 4.4.0-64-generic
Flash Version: