Arrow functions: Cleanup handling of the prototype property

test/mjsunit/harmony/arrow-functions.js

Index: test/mjsunit/harmony/arrow-functions.js
diff --git a/test/mjsunit/harmony/arrow-functions.js b/test/mjsunit/harmony/arrow-functions.js
index 22b1c94f7ffbd40af7de894b9c3645581c1682c3..0ffa9369919aa8b83bd88ebf6cbb57eea373eea3 100644
--- a/test/mjsunit/harmony/arrow-functions.js
+++ b/test/mjsunit/harmony/arrow-functions.js
@@ -8,7 +8,8 @@
 // "new" operator on them.
 assertEquals("function", typeof (() => {}));
 assertEquals(Function.prototype, Object.getPrototypeOf(() => {}));
-assertThrows("new (() => {})", TypeError);
+assertThrows(function() { new (() => {}); }, TypeError);
+assertFalse("prototype" in (() => {}));
 
 // Check the different syntax variations
 assertEquals(1, (() => 1)());