You can see "Extension: Google Hangouts" in Chrome Task Manager when Hangouts is active.
But I still think it's not malicious trick for browser wars, more likely that they abandoned Hangouts and will shut it down after some time, launching even more half-working chat services before that, with machine learning, VR, brands engagement, integrated video news and other crap everyone can't live without.
Found a decent write-up: https://webrtchacks.com/hangout-analysis-philipp-hancke/
Can't tell you whether or not that's the real reason. But I can definitely confirm that the lack of widely supported 'Plan B multiplexing' is (was?) a real pain point for WebRTC devs.
For example, on MacOS, there is a severe breaking CoreAudio bug in WebRC that hasn't been fixed for over 3 years which affects 8% of users by causing unmuted microphones to not transmit any audio [1]. We've never seen this problem come up with Hangouts though.
iOS builds for Google's WebRTC libjingle_peerconnection library have been broken for over 2 months, too [2].
It's no surprise that there is some core Hangouts team within Google building something else. Even Google's own AppRTC "reference" application implementation has some seriously questionable design decisions in its code (such as sending signaling messages to Google App Engine to forward over websockets).
Google needs to figure out how to bridge the gap between both organizations so that everyone can benefit from the stability gains made by the Hangouts team.
[1] https://bugs.chromium.org/p/webrtc/issues/detail?id=4799
These things take time, you know. Especially with the limited resources of Google, Mozilla not already having announced the deprecation of NPAPI plugins two years ago [1] and there not already being a web standard, mainly pushed by Google, that enables video and audio calling for every modern browser out there [2].
[0]: https://gsuiteupdates.googleblog.com/2017/02/google-hangouts...
[1]: https://blog.mozilla.org/futurereleases/2015/10/08/npapi-plu...
[2]: https://webrtc.org/
Still, they really nailed it with quantum. The dev tools are excellent (finally!). I can deal with the second rate extensions if it means compartmentalizing just a small slice of my life from Google.
Here is their doc: https://get.slack.help/hc/en-us/articles/205138367-Common-is...