Well, i'm not a creator of this topic, he doesn't reply for some reason. But even with both updated Android System Webview and Chrome in Google play, it shows Chrome 37. I was searching in google how to update it and it looks like I can't without root.
And still. It works without checking RTCDataChannel. I see only one decision of this problem - just remove it, since my app is made for Cordova, not Firefox or Edge. What do you think?
I also can't say "Your chrome version is outdated. Go and update it, and then use this app" to my users. By statisctics there's a lot of users of Andrdoid 4.4 in my country. Probably they all using webview version <2014