Reviewed by Antonio Gomes.

        Add new LayoutTest checking web history on document.location change.

        The new test enforce the current behavior; If redirection is caused by
        document.location change, immediately after a page load and without using
        setTimeout, a web history item shouldn't be created.

        History item and document.location change.
        https://bugs.webkit.org/show_bug.cgi?id=48117

        * http/tests/navigation/document-location-script-expected.txt: Added.
        * http/tests/navigation/document-location-script.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@70315 268f45cc-cd09-0410-ab3c-d52691b4dbfc