When Safari uses topContentInset, the scroll view height is incorrect. It should be modulated by the topContentInset (along with the y-origin, which it already is) <rdar://problem/16587084>
Created attachment 237988 [details] patch
Comment on attachment 237988 [details] patch Clearing flags on attachment: 237988 Committed r173548: <http://trac.webkit.org/changeset/173548>
All reviewed patches have been landed. Closing bug.