No bug - Adjust fuzziness for reftest on mac which showed up after merging autoland and inbound. r=me on a CLOSED TREE

layout/reftests/transform-3d/reftest.list

@@ -82,7 +82,7 @@ fuzzy(0-1,0-10000) == opacity-preserve3d-4.html opacity-preserve3d-4-ref.html
 == opacity-preserve3d-5.html opacity-preserve3d-5-ref.html
 == snap-perspective-1.html snap-perspective-1-ref.html
 == mask-layer-1.html mask-layer-ref.html
-fuzzy-if(webrender&&gtkWidget,8-8,100-100) == mask-layer-2.html mask-layer-ref.html
+fuzzy-if(webrender&&gtkWidget,8-8,100-100) fuzzy-if(webrender&&cocoaWidget,1-1,16-16) == mask-layer-2.html mask-layer-ref.html
 fuzzy-if(webrender,0-16,0-100) == mask-layer-3.html mask-layer-ref.html
 == split-intersect1.html split-intersect1-ref.html
 fuzzy(0-255,0-150) == split-intersect2.html split-intersect2-ref.html