Reviewed by Oliver Hunt.

        Fix for <rdar://problem/6607524> REGRESSION (Safari 3-4): I can't tab back to the URL field in an empty window (key loop is broken)

        I haven't been able to make a test for this since the problem is not reproducible within an empty iframe.

        * page/EventHandler.cpp: (WebCore::eventTargetNodeForDocument): We used to ensure that every html document had a body element.
          That is no longer true, so we should return the document element for a truly empty document.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@41501 268f45cc-cd09-0410-ab3c-d52691b4dbfc