Reviewed by Oliver.

        Replace AccessibilityObject::isRenderImage() with a virtual
        RenderObject::isRenderImage().

        * page/AccessibilityObject.cpp:
        (WebCore::AccessibilityObject::accessibilityIsIgnored):
        (WebCore::AccessibilityObject::addChildren):
        * page/AccessibilityObject.h:
        (WebCore::AccessibilityObject::isDetached):
        * rendering/RenderImage.h:
        (WebCore::RenderImage::isRenderImage):
        * rendering/RenderObject.h:
        (WebCore::RenderObject::isRenderImage):




git-svn-id: http://svn.webkit.org/repository/webkit/trunk@31652 268f45cc-cd09-0410-ab3c-d52691b4dbfc