Remove PaintPhaseClippingMask.

sky/engine/core/rendering/RenderBlock.cpp

Index: sky/engine/core/rendering/RenderBlock.cpp
diff --git a/sky/engine/core/rendering/RenderBlock.cpp b/sky/engine/core/rendering/RenderBlock.cpp
index facbf87b76667511e793f9df761ded9252cf95a4..eb53c309c375aabc04882f2cc919f227711676f6 100644
--- a/sky/engine/core/rendering/RenderBlock.cpp
+++ b/sky/engine/core/rendering/RenderBlock.cpp
@@ -716,11 +716,6 @@ void RenderBlock::paintObject(PaintInfo& paintInfo, const LayoutPoint& paintOffs
         return;
     }
 
-    if (paintPhase == PaintPhaseClippingMask) {
-        paintClippingMask(paintInfo, paintOffset);
-        return;
-    }
-
     // We're done.  We don't bother painting any children.
     if (paintPhase == PaintPhaseBlockBackground)
         return;