Update V8 to r6768 as required by WebKit r78450
Change-Id: Ib8868ff7147a76547a8d1d85f257ebe8546a3d3f
diff --git a/test/mjsunit/json.js b/test/mjsunit/json.js
index a0be8dd..812ffeb 100644
--- a/test/mjsunit/json.js
+++ b/test/mjsunit/json.js
@@ -415,3 +415,17 @@
falseNum.__proto__ = Number.prototype;
falseNum.toString = function() { return 42; };
assertEquals('"42"', JSON.stringify(falseNum));
+
+// We don't currently allow plain properties called __proto__ in JSON
+// objects in JSON.parse. Instead we read them as we would JS object
+// literals. If we change that, this test should change with it.
+//
+// Parse a non-object value as __proto__. This must not create a
+// __proto__ property different from the original, and should not
+// change the original.
+var o = JSON.parse('{"__proto__":5}');
+assertEquals(Object.prototype, o.__proto__); // __proto__ isn't changed.
+assertEquals(0, Object.keys(o).length); // __proto__ isn't added as enumerable.
+
+
+