Reviewed by Nikolas Zimmermann.

        Make SVG PendingResources use RefPtr
        https://bugs.webkit.org/show_bug.cgi?id=43587

        Convert SVGDocumentExtensions::m_pendingResources to use a RefPtr for 
        pending elements instead of a raw pointer so that pending elements can't
        be freed prematurely.

        Test: svg/custom/use-invalid-pattern.svg

        * rendering/RenderSVGResourceContainer.cpp:
        (WebCore::RenderSVGResourceContainer::registerResource):
        * svg/SVGDocumentExtensions.cpp:
        (WebCore::SVGDocumentExtensions::addPendingResource):
        (WebCore::SVGDocumentExtensions::removePendingResource):
        * svg/SVGDocumentExtensions.h:
        * svg/SVGElement.cpp:
        (WebCore::SVGElement::insertedIntoDocument):
2010-09-06  Justin Schuh  <jschuh@chromium.org>

        Reviewed by Nikolas Zimmermann.

        Test that an invalid pending resource pattern doesn't crash
        https://bugs.webkit.org/show_bug.cgi?id=43587

        * platform/mac-snowleopard/svg: Added.
        * platform/mac-snowleopard/svg/custom: Added.
        * platform/mac-snowleopard/svg/custom/use-invalid-pattern-expected.txt: Added.
        * svg/custom/use-invalid-pattern.svg: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@66847 268f45cc-cd09-0410-ab3c-d52691b4dbfc