Reviewed by Antti Koivisto.

        move :not over to using selectorList instead of simpleSelector
        https://bugs.webkit.org/show_bug.cgi?id=56894

        Saves memory and simplifies code.

        No new tests since existing tests cover this code.

        * css/CSSGrammar.y:
        Also removed extranenous calls to updateLastSelectorLineAndPosition in
        simple_selector_list. These happened to work, but are only actually
        needed in selector_list.
        * css/CSSParserValues.h:
        * css/CSSSelector.cpp:
        (WebCore::CSSSelector::specificityForOneSelector):
        Removed null-check. The parser null-checks, I don't see why we need to here.
        (WebCore::CSSSelector::selectorText):
        Ditto.
        (WebCore::CSSSelector::setArgument):
        (WebCore::CSSSelector::isSimple):
        * css/CSSSelector.h:
        * css/CSSSelectorList.cpp:
        (WebCore::forEachTagSelector):
        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::SelectorChecker::checkOneSelector):
        (WebCore::collectFeaturesFromSelector):
        (WebCore::collectFeaturesFromList):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@81845 268f45cc-cd09-0410-ab3c-d52691b4dbfc