Add SMIL deprecation warning

LayoutTests/svg/filters/filter-refresh-expected.txt

+CONSOLE WARNING: SVG's SMIL animations (<animate>, <set>, etc.) are deprecated and will be removed. Please use CSS animations or Web animations instead.
 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [140, 140, 36, 36],
         [140, 100, 36, 36],
@@ skipping 22 matching lines @@
         [10, 90, 30, 30],
         [10, 90, 30, 30],
         [10, 50, 30, 30],
         [10, 50, 30, 30],
         [0, 10, 30, 30]
       ]
     }
   ]
 }