[olliej]

[edit: I re-read the text and I think this is as you say: if an app has/is a browser, then that app obviously knows your browsing history]

Nope, its extensions :)

Just using a WebView doesn't give you any safari data, and if you're using a UISafariView or whatever its called I think its basically an opaque view with limited accessible data (and the view itself is running in another process)