Reviewed by Darin Adler.

        - fix https://bugs.webkit.org/show_bug.cgi?id=17655
          <rdar://problem/5778077> REGRESSION (3.1.1-TOT): Reproducible crash calling querySelector on viewless Document

        Test: fast/dom/SelectorAPI/viewless-document.html

        * css/CSSStyleSelector.cpp:
        (WebCore::CSSStyleSelector::CSSStyleSelector): Updated to initialize the
        selector checker.
        (WebCore::CSSStyleSelector::init): Removed initialization of
        m_collectRulesOnly, which is now part of the selector checker.
        (WebCore::CSSStyleSelector::matchRules): Updated for renames and data
        moved into the selector checker.
        (WebCore::CSSStyleSelector::matchRulesForList): Ditto.
        (WebCore::CSSStyleSelector::initForStyleResolve): Added a PseudoId
        argument, which is used to initialize a data member of the selector
        checker. Updated for renames. Removed initialization of m_isXMLDoc
        because this bit is now initialized only once in the selector checker's
        constructor.
        (WebCore::CSSStyleSelector::SelectorChecker::SelectorChecker): Added.
        (WebCore::CSSStyleSelector::SelectorChecker::checkPseudoState): Changed
        into a SelectorChecker method.
        (WebCore::CSSStyleSelector::SelectorChecker::checkSelector): Added. Used
        by querySelector() and querySelectorAll().
        (WebCore::CSSStyleSelector::canShareStyleWithElement): Updated for data
        moved into the selector checker.
        (WebCore::CSSStyleSelector::matchUARules): Ditto.
        (WebCore::CSSStyleSelector::styleForElement):
        (WebCore::CSSStyleSelector::pseudoStyleForElement): Ditto. Also removed
        code that set the parentStyle variable after the last place it is
        accessed, and changed to ensure that m_style is set early in this
        function.
        (WebCore::CSSStyleSelector::adjustRenderStyle): Updated for data moved
        into the selector checker.
        (WebCore::CSSStyleSelector::styleRulesForElement): Ditto.
        (WebCore::CSSStyleSelector::checkSelector): Ditto. Also changed to pass
        the element's style and the parent style to the selector checker, as
        well as the dynamic pseudo variable and the selector attributes vector.
        (WebCore::CSSStyleSelector::SelectorChecker::checkOneSelector): Added
        arguments for the style of the base element and its parent. When the
        elementStyle argument is 0, the style is fetched from the element
        and its parent as needed. Also changed to take a reference to the
        dynamic pseudo ID and a pointer to the vector of attributes affecting
        the match.
        (WebCore::CSSStyleSelector::applyProperty): Updated for data moved
        into the selector checker.
        (WebCore::CSSStyleSelector::checkForGenericFamilyChange): Ditto.
        (WebCore::CSSStyleSelector::getComputedSizeFromSpecifiedSize): Ditto.
        (WebCore::CSSStyleSelector::fontSizeForKeyword): Ditto.
        (WebCore::CSSStyleSelector::getColorFromPrimitiveValue): Ditto.
        (WebCore::CSSStyleSelector::SelectorChecker::allVisitedStateChanged):
        Changed into a SelectorChecker method.
        (WebCore::CSSStyleSelector::SelectorChecker::visitedStateChanged):
        Ditto.

        * css/CSSStyleSelector.h:
        Added a SelectorChecker class and moved data and methods used in
        checking selectors into it.
        (WebCore::CSSStyleSelector::allVisitedStateChanged): Changed to call the
        SelectorChecker method.
        (WebCore::CSSStyleSelector::visitedStateChanged): Ditto.
        * dom/Node.cpp:
        (WebCore::Node::querySelector): Changed to use a SelectorChecker instead
        of the document's style selector.
        * dom/SelectorNodeList.cpp:
        (WebCore::SelectorNodeList::SelectorNodeList): Ditto.

LayoutTests:

        Reviewed by Darin Adler.

        - test for https://bugs.webkit.org/show_bug.cgi?id=17655
          <rdar://problem/5778077> REGRESSION (3.1.1-TOT): Reproducible crash calling querySelector on viewless Document

        * fast/dom/SelectorAPI/resources/viewless-document.js: Added.
        * fast/dom/SelectorAPI/viewless-document-expected.txt: Added.
        * fast/dom/SelectorAPI/viewless-document.html: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@33939 268f45cc-cd09-0410-ab3c-d52691b4dbfc