Of course a product would evolve in 9 years, that doesn't mean that the credit for the full browser goes to Apple. If so, then why did they have to fork KHTML in the first place? Of course, KHTML benefited too, because of the LGPL/GPL licensing, but that doesn't change facts now.
So, saying that Google took Apple's full browser is not really true, Chrome mostly took Webcore, they have their own JS engine and their own UI chrome(!), and WebCore has a lot of roots in KHTML
Instructive link, Apple praising KHTML and reasoning why they used it http://lists.kde.org/?l=kfm-devel&m=104197092318639&...
So, saying that Google took Apple's full browser is not really true, Chrome mostly took Webcore, they have their own JS engine and their own UI chrome(!), and WebCore has a lot of roots in KHTML