Merge V8 5.3.332.45.  DO NOT MERGE

Test: Manual

FPIIM-449

Change-Id: Id3254828b068abdea3cb10442e0172a8c9a98e03
(cherry picked from commit 13e2dadd00298019ed862f2b2fc5068bba730bcf)
diff --git a/test/mjsunit/es6/json.js b/test/mjsunit/es6/json.js
index 4c1ada8..c049a25 100644
--- a/test/mjsunit/es6/json.js
+++ b/test/mjsunit/es6/json.js
@@ -9,5 +9,7 @@
   assertTrue(desc.configurable);
   assertFalse(desc.writable);
   assertEquals("JSON", desc.value);
+  delete JSON[Symbol.toStringTag];
+  assertEquals('[object Object]', "" + JSON);
 }
 testJSONToString();