Remove mask painting.

sky/engine/core/rendering/RenderReplaced.cpp

Index: sky/engine/core/rendering/RenderReplaced.cpp
diff --git a/sky/engine/core/rendering/RenderReplaced.cpp b/sky/engine/core/rendering/RenderReplaced.cpp
index 2643155cd4adb6c2d24333aa7763a52bca79f8e9..2a60b8f5654646ec1fde98e687514b31395fd986 100644
--- a/sky/engine/core/rendering/RenderReplaced.cpp
+++ b/sky/engine/core/rendering/RenderReplaced.cpp
@@ -93,11 +93,6 @@ void RenderReplaced::paint(PaintInfo& paintInfo, const LayoutPoint& paintOffset)
 
     LayoutPoint adjustedPaintOffset = paintOffset + location();
 
-    if (paintInfo.phase == PaintPhaseMask) {
-        paintMask(paintInfo, adjustedPaintOffset);
-        return;
-    }
-
     if (hasBoxDecorationBackground())
         paintBoxDecorationBackground(paintInfo, adjustedPaintOffset);