No company would do that. What OEM is going to pay for a new, less compatible browser engine written in an unproven language that no one knows? Even if it is safer, that's pretty much the lowest priority for many companies, and safer != unable to exploit.

Companies who want to embed a browser engine into their product use WebKit, which is free, and maintained by multiple other companies, and has been around long enough that it should be compatible with pretty much any website that exists.