[stiGGG]

AFAIK keychain access is only allowed for apps distributed through the Mac AppStore since a while. This is why Chrome removed the feature.

[SpikeDad]

There's nothing in the developer section

https://developer.apple.com/documentation/security

that specifies this restriction. Maybe I couldn't find the reference.

I'm pretty sure the Chrome folks removed it because they didn't think the Keychain was secure (at least from the readings I've done).