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/math.js b/test/mjsunit/es6/math.js
index cb43bd5..dc761d6 100644
--- a/test/mjsunit/es6/math.js
+++ b/test/mjsunit/es6/math.js
@@ -9,5 +9,7 @@
   assertTrue(desc.configurable);
   assertFalse(desc.writable);
   assertEquals("Math", desc.value);
+  delete Math[Symbol.toStringTag];
+  assertEquals('[object Object]', "" + Math);
 }
 testMathToString();