Reviewed by darin.  Landed by eseidel.

        Fix for http://bugzilla.opendarwin.org/show_bug.cgi?id=5978
        WebKIt+SVG should use SVGDocumentImpl for image/svg+xml

        Make sure SVGDocument is created for standalone svg
        documents.

        * ksvg2/svg/SVGDOMImplementation.cpp:
        (SVGDOMImplementation::instance):
        (SVGDOMImplementation::createDocument):
        * ksvg2/svg/SVGDOMImplementation.h:
        * ksvg2/svg/SVGDocument.cpp:
        (WebCore::SVGDocument::SVGDocument):
        (WebCore::SVGDocument::~SVGDocument):
        * ksvg2/svg/SVGDocument.h:
        * ksvg2/svg/SVGTests.cpp:
        (WebCore::SVGTests::isValid):
        * ksvg2/svg/SVGTitleElement.cpp:
        * ksvg2/svg/SVGTitleElement.h:
        * page/Frame.cpp:
        (WebCore::Frame::begin):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@14595 268f45cc-cd09-0410-ab3c-d52691b4dbfc