The advent of Native Client combined with this move means the Chrome Web Store is going to end up positioned as a direct competitor to Steam.

That's pretty interesting, honestly. It'll mean great things for consumers: I bet playing a game in your browser could be really convenient compared to downloading and installing Steam and then going through the motions for that platform. But Steam has 7 years on the Web Store with all kinds of great platform features like Steam Play, Cloud, Wallet, etc.

An exciting time to be a web and game developer, to be sure!