Remove PaintPhaseClippingMask.

sky/engine/core/rendering/GraphicsContextAnnotator.cpp

Index: sky/engine/core/rendering/GraphicsContextAnnotator.cpp
diff --git a/sky/engine/core/rendering/GraphicsContextAnnotator.cpp b/sky/engine/core/rendering/GraphicsContextAnnotator.cpp
index 13c6462d803e52406e4f0c4e01b0364370ee0cca..620f780a98212c7d85836d0db321c058272adcfd 100644
--- a/sky/engine/core/rendering/GraphicsContextAnnotator.cpp
+++ b/sky/engine/core/rendering/GraphicsContextAnnotator.cpp
@@ -70,8 +70,6 @@ static const char* paintPhaseName(blink::PaintPhase phase)
         return "TextClip";
     case blink::PaintPhaseMask:
         return "Mask";
-    case blink::PaintPhaseClippingMask:
-        return "ClippingMask";
     default:
         ASSERT_NOT_REACHED();
         return "<unknown>";