Revert of [keys] Simplify KeyAccumulator

test/mjsunit/es6/reflect.js

Index: test/mjsunit/es6/reflect.js
diff --git a/test/mjsunit/es6/reflect.js b/test/mjsunit/es6/reflect.js
index d597a78901ad35a081d167a87c651cad01f86c0c..ee272b0fc799da2c8de704675e53f90806e40756 100644
--- a/test/mjsunit/es6/reflect.js
+++ b/test/mjsunit/es6/reflect.js
@@ -541,13 +541,6 @@
       [s2]: 0, "-1": 0, "88": 0, "aaa": 0 };
   assertEquals(["0", "42", "88", "bla", "-1", "aaa", s1, s2],
       Reflect.ownKeys(obj));
-  // Force dict-mode elements.
-  delete obj[0];
-  assertEquals(["42", "88", "bla", "-1", "aaa", s1, s2],
-      Reflect.ownKeys(obj));
-  // Force dict-mode properties.
-  delete obj["bla"];
-  assertEquals(["42", "88", "-1", "aaa", s1, s2], Reflect.ownKeys(obj));
 })();