Reviewed by Alexey Proskuryakov.

        Remove cached document reference from CSSStyleSheet and XSLStyleSheet.
        https://bugs.webkit.org/show_bug.cgi?id=52084

        Test: fast/dom/css-delete-doc.html

        * css/CSSMediaRule.cpp:
        (WebCore::CSSMediaRule::insertRule):
        (WebCore::CSSMediaRule::deleteRule):
        * css/CSSStyleSheet.cpp:
        (WebCore::CSSStyleSheet::CSSStyleSheet):
        (WebCore::CSSStyleSheet::document):
        * css/CSSStyleSheet.h:
        * xml/XSLStyleSheet.h:
        (WebCore::XSLStyleSheet::parentStyleSheet):
        * xml/XSLStyleSheetLibxslt.cpp:
        (WebCore::XSLStyleSheet::XSLStyleSheet):
        (WebCore::XSLStyleSheet::cachedResourceLoader):
        (WebCore::XSLStyleSheet::setParentStyleSheet):
        (WebCore::XSLStyleSheet::ownerDocument):
        * xml/XSLStyleSheetQt.cpp:
        (WebCore::XSLStyleSheet::XSLStyleSheet):
        (WebCore::XSLStyleSheet::cachedResourceLoader):
        (WebCore::XSLStyleSheet::ownerDocument):
2011-01-26  Emil A Eklund  <eae@chromium.org>

        Reviewed by Alexey Proskuryakov.

        Remove cached document reference from CSSStyleSheet and XSLStyleSheet.
        https://bugs.webkit.org/show_bug.cgi?id=52084

        Added test for accessing a style sheet associated with a document that
        has been removed.

        * fast/dom/css-delete-doc-expected.txt: Added.
        * fast/dom/css-delete-doc.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@76728 268f45cc-cd09-0410-ab3c-d52691b4dbfc