One suggestion if you want a turn key solution is an application called PolicyPak. The nice thing about it is that you don't have to worry about involved solutions that require extensions and templates. PP integrates with Group Policy Management console and allows you to create GPOs for third party applications as easily as you already create GPOs for the standard stuff you do now like Windows 7, IE and Office. You can create a separate GPO for each application they support if you want. We use it and it is really slick. It supports all the major third party browsers such as the two you mentioned and Opera I think. Here is a link to their demo to show how they support Google Chrome. http://www.policypak.com/products/manage-google-chrome-using-group-policy-policypak.html
What's great too is that they offer a trial mode and something called community mode, both free, so you can try it out for yourself and experiment with GPOs for all the apps they support. Not sure if this was what you were expecting.