set-dangerous-headers.html shouldn't set allowed header to same value

set-dangerous-headers.html shouldn't set allowed header to same value
as forbidden headers.  AUTHORIZATION is an allowed header, and the
value is being set to "foobar" like the forbidden headers, which causes
the test to fail when run using http server that doesn't strip the
AUTHORIZATION header.
https://bugs.webkit.org/show_bug.cgi?id=28818

Patch by Julie Parent <jparent@chromium.org> on 2009-08-28
Reviewed by Alexey Proskuryakov.

* http/tests/xmlhttprequest/set-dangerous-headers.html:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@47873 268f45cc-cd09-0410-ab3c-d52691b4dbfc