This is exactly what Google wanted out of Chrome. As long as Chrome is pushing other browsers to improve then Google wins. Chrome domination isn't the goal for them (though I'm sure they wouldn't mind if that happens). Their end goal is to challenge the browser market to improve. Standards compliance, faster Javascript performance, as long as these continue to advance then Google wins, regardless of what browser a user is using.
This is typical Microsoft, they cannot admit a non-commercial entity to be their main competitor.
These browser wars are funny. They have been going on for so many years but neither is there a cler winner nor an idea of what the prize would be like. Does winning this war really matter any more? I am not sure why GOOG and MSFT are really fighting it in the first place.
Because the internet is slowing 'becoming' computing. And he who holds the keys, unlocks the doors. ;)