stop using exotic clipops

cc/proto/skia_conversions_unittest.cc

Index: cc/proto/skia_conversions_unittest.cc
diff --git a/cc/proto/skia_conversions_unittest.cc b/cc/proto/skia_conversions_unittest.cc
index c6f43b6fefd82829267d3854959073faef3c75f0..bc6ddba2acd44c4840551cc50ca68bf1d52fa4f4 100644
--- a/cc/proto/skia_conversions_unittest.cc
+++ b/cc/proto/skia_conversions_unittest.cc
@@ -22,8 +22,7 @@ TEST(SkiaProtoConversionsTest, SerializeDeserializeSkClipOp) {
   // as skia constricts the valid ops for clipping
   // https://bugs.chromium.org/p/skia/issues/detail?id=3191
   const SkClipOp ops[] = {
-      SkClipOp::kDifference, SkClipOp::kIntersect,         SkClipOp::kUnion,
-      SkClipOp::kXOR,        SkClipOp::kReverseDifference, SkClipOp::kReplace,
+      SkClipOp::kDifference, SkClipOp::kIntersect,
   };
   for (SkClipOp op : ops) {
     EXPECT_EQ(op, SkClipOpFromProto(SkClipOpToProto(op)));