demobrowser from QtWebEngine cannot play Netflix

I use a git snaphot from March with 47-based Chromium and 5.7 branch. I have DRM pugins from Chrome 47 installed under /opt/google/chrome and the DRM demo http://demo.castlabs.com plays fine in demobrowser. However demobrowser can't play Netflix videos. Netflix says that the browser is in Incognito mode and refuses to play (see attach). In console I see

Installed Qt WebEngine dictionaries directory not found at location /opt/Qt-custom/qtwebengine_dictionaries. Trying application directory...
Qt WebEngine dictionaries directory not found at location /home/krasu/src/examples/webenginewidgets/demobrowser/qtwebengine_dictionaries. Trying fallback directory... Spellcheck MAY NOT work.
Installed Qt WebEngine dictionaries directory not found at location /opt/Qt-custom/qtwebengine_dictionaries. Trying application directory...
Qt WebEngine dictionaries directory not found at location /opt/Qt-custom/libexec/qtwebengine_dictionaries. Trying fallback directory... Spellcheck MAY NOT work.
js: Uncaught ReferenceError: chrome is not defined

According to https://insights.ubuntu.com/2014/10/10/watch-netflix-in-ubuntu-today/ Chrome should be able to play Netflix. For some reason Chromium doesn't play.

I cannot test 49-based branch since Google doesn't support 32-bit platforms anymore, and the DRM plugin from Chrome 49 is not available on the 32-bit platform.