Revert of ValueSerializer: Distinguish between 'undefined' and an absent property.

test/unittests/value-serializer-unittest.cc

Index: test/unittests/value-serializer-unittest.cc
diff --git a/test/unittests/value-serializer-unittest.cc b/test/unittests/value-serializer-unittest.cc
index ec2df077f57021ad0e12d6f4c7c68519bbcc12dd..db663fafd83f4882b0eaf8eec4bcd07245400ea1 100644
--- a/test/unittests/value-serializer-unittest.cc
+++ b/test/unittests/value-serializer-unittest.cc
@@ -1243,36 +1243,6 @@
         EXPECT_TRUE(EvaluateScriptForResultBool("!(0 in result[1])"));
         EXPECT_TRUE(EvaluateScriptForResultBool("result[1][1] === true"));
       });
-}
-
-TEST_F(ValueSerializerTest, RoundTripDenseArrayContainingUndefined) {
-  // In previous serialization versions, this would be interpreted as an absent
-  // property.
-  RoundTripTest("[undefined]", [this](Local<Value> value) {
-    ASSERT_TRUE(value->IsArray());
-    EXPECT_EQ(1u, Array::Cast(*value)->Length());
-    EXPECT_TRUE(EvaluateScriptForResultBool("result.hasOwnProperty(0)"));
-    EXPECT_TRUE(EvaluateScriptForResultBool("result[0] === undefined"));
-  });
-}
-
-TEST_F(ValueSerializerTest, DecodeDenseArrayContainingUndefined) {
-  // In previous versions, "undefined" in a dense array signified absence of the
-  // element (for compatibility). In new versions, it has a separate encoding.
-  DecodeTest({0xff, 0x09, 0x41, 0x01, 0x5f, 0x24, 0x00, 0x01},
-             [this](Local<Value> value) {
-               EXPECT_TRUE(EvaluateScriptForResultBool("!(0 in result)"));
-             });
-  DecodeTest(
-      {0xff, 0x0b, 0x41, 0x01, 0x5f, 0x24, 0x00, 0x01},
-      [this](Local<Value> value) {
-        EXPECT_TRUE(EvaluateScriptForResultBool("0 in result"));
-        EXPECT_TRUE(EvaluateScriptForResultBool("result[0] === undefined"));
-      });
-  DecodeTest({0xff, 0x0b, 0x41, 0x01, 0x2d, 0x24, 0x00, 0x01},
-             [this](Local<Value> value) {
-               EXPECT_TRUE(EvaluateScriptForResultBool("!(0 in result)"));
-             });
 }
 
 TEST_F(ValueSerializerTest, RoundTripDate) {