Unprefix the CSS 'filter' property

third_party/WebKit/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,
       "paintInvalidations": [
         {
           "object": "LayoutSVGContainer g",
           "rect": [10, 170, 132, 36],
           "reason": "SVG resource change"
         },
         {
           "object": "LayoutSVGContainer g",
           "rect": [10, 130, 132, 36],
           "reason": "SVG resource change"
         },
         {
           "object": "LayoutSVGRect rect id='separate2'",
           "rect": [140, 140, 36, 36],
           "reason": "style change"
         },
         {
           "object": "LayoutSVGRect rect id='filtered'",
           "rect": [140, 100, 36, 36],
-          "reason": "style change"
+          "reason": "subtree"
         },
         {
           "object": "LayoutSVGContainer g",
           "rect": [140, 60, 36, 36],
           "reason": "SVG resource change"
         },
         {
           "object": "LayoutSVGContainer g",
           "rect": [90, 170, 36, 36],
           "reason": "SVG resource change"
@@ skipping 239 matching lines @@
         },
         {
           "object": "LayoutSVGContainer use",
           "reason": "none"
         }
       ]
     }
   ]
 }