Reviewed by Oliver Hunt.

        Removed a use of markDOMObjectWrapper: CSS Object Model
        https://bugs.webkit.org/show_bug.cgi?id=59057

        This is 24 hours of my life I will never get back. Thank you, W3C.

        * GNUmakefile.list.am:
        * WebCore.gypi:
        * WebCore.vcproj/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj: Build!

        * bindings/js/JSCSSFontFaceRuleCustom.cpp:
        * bindings/js/JSCSSImportRuleCustom.cpp:
        * bindings/js/JSCSSMediaRuleCustom.cpp:
        * bindings/js/JSCSSPageRuleCustom.cpp:
        * bindings/js/JSCSSRuleCustom.cpp:
        (WebCore::JSCSSRuleOwner::isReachableFromOpaqueRoots):
        (WebCore::JSCSSRuleOwner::finalize):
        (WebCore::wrapperOwner):
        (WebCore::wrapperContext):
        (WebCore::JSCSSRule::markChildren):
        * bindings/js/JSCSSRuleListCustom.cpp:
        (WebCore::JSCSSRuleListOwner::isReachableFromOpaqueRoots):
        (WebCore::JSCSSRuleListOwner::finalize):
        (WebCore::wrapperOwner):
        (WebCore::wrapperContext):
        (WebCore::toJS):
        * bindings/js/JSCSSStyleDeclarationCustom.cpp:
        (WebCore::JSCSSStyleDeclarationOwner::isReachableFromOpaqueRoots):
        (WebCore::JSCSSStyleDeclarationOwner::finalize):
        (WebCore::wrapperOwner):
        (WebCore::wrapperContext):
        (WebCore::JSCSSStyleDeclaration::markChildren): Removed custom mark functions,
        and replaced with use of the opaque roots system. This has the nice benefit
        of allowing us to eagerly recycle far more CSS wrappers and their associated
        DOM wrappers.

        (WebCore::JSCSSStyleDeclaration::getPropertyCSSValue): Made this function
        custom because it must maintain the sorrowful invariant that primitive
        values can be mapped back to objects that are reachable through the DOM.
        We maintain this invariant through an external hash table because
        making all primitive values bigger would be a too-large memory use
        penalty. Luckily, nobody uses this feature, so the cost of the hash table
        is no big deal.

        (WebCore::toJS): We need a custom toJS so we can specify our own WeakHandleOwner.

        * bindings/js/JSCSSStyleRuleCustom.cpp: Removed custom mark, as above.

        * bindings/js/JSCSSValueCustom.cpp:
        (WebCore::cssValueRoots):
        (WebCore::JSCSSValueOwner::isReachableFromOpaqueRoots):
        (WebCore::JSCSSValueOwner::finalize):
        (WebCore::wrapperOwner):
        (WebCore::wrapperContext): Use the opaque roots system. Piggy-back on
        the external hash table filled by JSCSSStyleDeclaration::getPropertyCSSValue.

        * bindings/js/JSDocumentCustom.cpp:
        (WebCore::JSDocument::markChildren): No need to mark our stylesheet list,
        since all style-related objects can use our opaque root to determine
        liveness.

        * bindings/js/JSMediaListCustom.cpp: Added.
        (WebCore::JSMediaListOwner::isReachableFromOpaqueRoots):
        (WebCore::JSMediaListOwner::finalize):
        (WebCore::wrapperOwner):
        (WebCore::wrapperContext):
        (WebCore::toJS): Use the opaque roots system.

        * bindings/js/JSNodeCustom.h:
        (WebCore::root): Added helpers for computing style-related roots.

        * bindings/js/JSStyleSheetCustom.cpp:
        (WebCore::JSStyleSheetOwner::isReachableFromOpaqueRoots):
        (WebCore::JSStyleSheetOwner::finalize):
        (WebCore::wrapperOwner):
        (WebCore::wrapperContext):
        (WebCore::JSStyleSheet::markChildren): Use the opaque roots system instead
        of direct marking.
        
        * bindings/js/JSStyleSheetListCustom.cpp:
        (WebCore::JSStyleSheetListOwner::isReachableFromOpaqueRoots):
        (WebCore::JSStyleSheetListOwner::finalize):
        (WebCore::wrapperOwner):
        (WebCore::wrapperContext):
        (WebCore::toJS): Ditto.

        * bindings/js/JSWebKitCSSKeyframeRuleCustom.cpp:
        * bindings/js/JSWebKitCSSKeyframesRuleCustom.cpp:
        * css/CSSFontFaceRule.idl:
        * css/CSSImportRule.idl: No more custom mark, since we use the opaque
        roots system instead.

        * css/CSSMediaRule.cpp:
        (WebCore::CSSMediaRule::CSSMediaRule): Fixed a bug where a media rule
        would incorrectly have no parent, since this got in the way of correctly
        computing the media rule's root.

        * css/CSSMediaRule.idl:
        * css/CSSPageRule.idl:
        * css/CSSRuleList.idl:
        * css/CSSStyleDeclaration.idl:
        * css/CSSStyleRule.idl:
        * css/MediaList.idl: Match behavior changes above.

        * css/StyleBase.cpp:
        (WebCore::StyleBase::node): Helper function for computing roots of the
        style system. This object model is pretty weird and not very well factored,
        but I'm pretty sure this covers all the relevant cases.

        * css/StyleBase.h:
        * css/StyleSheetList.idl:
        * css/WebKitCSSKeyframeRule.idl:
        * css/WebKitCSSKeyframesRule.idl: Updated to match the behavior changes above.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@84527 268f45cc-cd09-0410-ab3c-d52691b4dbfc