REGRESSION (r64518): Most regression tests fail on ASSERT(shouldTrackVisitedLinks)
        on Snow Leopard.

        Platforms that use strategies now use a different code path than others, and that code path
        lacks necessary checks. We don't have a Snow Leopard debug buildbot.

        * page/PageGroup.cpp: (WebCore::PageGroup::addVisitedLinkHash): The private version of
        addVisitedLink() must not be called when we're not tracking visited links.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@64535 268f45cc-cd09-0410-ab3c-d52691b4dbfc