[Karunamon]

One could make a good argument that Chrome was only adopted due to Google's popularity in the search space, and leveraging that to push messages along the lines of "Upgrade your browser".

Not that there's anything wrong with that, but I don't think Chrome would be anything near what it is today without all of the google.com referrals.

[Drakim]

This is most likely true for Chrome yes, but it's almost definitely true for IE. I feel confident claiming that at the very least half of the IE users use it because they don't have a choice or because they got it as default on Windows.