Mystery Mac OS X Google Service

I’ve just noticed a previously unnoticed item in my Mac OS X Services menu. It reads Search with Google. It means you can search Google from any application by selecting a word or phrase and choosing Search with Google from the Services menu. This is basically a good thing. The trouble is: Safari is used to display the search results. In my case Safari isn’t my default browser, so I don’t necessarily want or expect my results to open in Safari. How did this item get there? Did Safari register this service? If so, should Camino or OmniWeb also add a Search Google using Camino, or Search Google using OmniWeb? Why not just use the default browser?