I think you may have misunderstood my question or I am not understanding your assertion.
With Chrome being as widely used as it is, there seems to me, no problem in gathering data from Chrome users from the whole internet. Unless Chrome specifically does not load certain sites that FF and Exploder will load, or if there is a certain type of site that Chrome users are too dumb to go to ect. The data would be gathered from the entire internet. Just not with different browsers.