Rebaseline LayoutTests/fast/xmlhttprequest/xmlhttprequest-nonexistent-file.html for Windows and Linux. Chrome allows xhr's to local directories (if the security origin of the document is file://) and Safari does not, so when testXHRDirectory is run on Safari hits an error handler, but returns a real result in Chrome. Mac is still marked as failing because of unimplemented test shell features (See http://crbug.com/20458 for more details).

      TEST=layout test try bots
BUG=20458,20450,18686

Review URL: http://codereview.chromium.org/173598

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@24756 0039d316-1c4b-4281-b951-d872f2087c98