This is exactly how updates should be done. Usually, I'm not that big of a fan of things that Google does, but this is a great achievement. Hats off to those who contributed to this. I hope all update systems eventually work this way.
Adobe? Apple? Those are the two vendors that I can imagine people having installed on most, if not all Windows computers. And I know for a fact they both distribute updates as full copies of their software waying in at a couple hundred to several hundred megabytes, requiring manual updates, pop up windows and restarts.
I've yet to see anyone do updates as fast or seamlessly as Google.
https://wiki.mozilla.org/Software_Update:MAR
While Firefox updates in the past were not as quiet or seamless as Chrome updates, Mozilla is moving in that direction as part of the new "rapid release" process:
Technology marches on. I have ideas for improving bsdiff, too.