Consider intrinsic size for SVG as list-style-image

Source/core/rendering/RenderListMarker.cpp

Index: Source/core/rendering/RenderListMarker.cpp
diff --git a/Source/core/rendering/RenderListMarker.cpp b/Source/core/rendering/RenderListMarker.cpp
index fe936092b3cd8bea91adf3c18e7641d54bfbde9a..9ea89bdb5081ab5f228b71cde49965910a10e430 100644
--- a/Source/core/rendering/RenderListMarker.cpp
+++ b/Source/core/rendering/RenderListMarker.cpp
@@ -1377,7 +1377,9 @@ void RenderListMarker::updateContent()
         // FIXME: This is a somewhat arbitrary width.  Generated images for markers really won't become particularly useful
         // until we support the CSS3 marker pseudoclass to allow control over the width and height of the marker box.
         int bulletWidth = style()->fontMetrics().ascent() / 2;
-        m_image->setContainerSizeForRenderer(this, IntSize(bulletWidth, bulletWidth), style()->effectiveZoom());
+        IntSize defaultBulletSize(bulletWidth, bulletWidth);
+        IntSize imageSize = calculateImageIntrinsicDimensions(m_image.get(), defaultBulletSize, DoNotScaleByEffectiveZoom);
+        m_image->setContainerSizeForRenderer(this, imageSize, style()->effectiveZoom());
         return;
     }