[alessivs]

As noted in a sibling to your comment, there's a choice between WebKit and Blink (your build allowing).

Here's QT's note addressing your concern in QtWebEngine: https://wiki.qt.io/QtWebEngine#Relationship_to_Chromium

    Auxiliary services that talk to Google platforms are stripped out

[smitty1e]

So, if Chromium turns into a bun fight with Google, the Open Source components would just fork?