Fix spec-compliance bug in ArrayIteratorPrototype.

ArrayIteratorPrototype must not provide Symbol.iterator.

R=rossberg
BUG=

Review URL: https://codereview.chromium.org/1749093002

Cr-Commit-Position: refs/heads/master@{#34386}

src/js/array-iterator.js

@@ -117,8 +117,6 @@ utils.InstallFunctions(ArrayIterator.prototype, DONT_ENUM, [
   'next', ArrayIteratorNext
 ]);
 utils.SetFunctionName(ArrayIteratorIterator, iteratorSymbol);
-%AddNamedProperty(ArrayIterator.prototype, iteratorSymbol,
-                  ArrayIteratorIterator, DONT_ENUM);
 %AddNamedProperty(ArrayIterator.prototype, toStringTagSymbol,
                   "Array Iterator", READ_ONLY | DONT_ENUM);
 

test/mjsunit/es6/array-iterator.js

@@ -160,7 +160,7 @@ function TestArrayIteratorPrototype() {
   assertArrayEquals(['next'],
       Object.getOwnPropertyNames(ArrayIteratorPrototype));
   assertHasOwnProperty(ArrayIteratorPrototype, 'next', DONT_ENUM);
-  assertHasOwnProperty(ArrayIteratorPrototype, Symbol.iterator, DONT_ENUM);
+  assertFalse(ArrayIteratorPrototype.hasOwnProperty(Symbol.iterator));
 
   assertEquals("[object Array Iterator]",
       Object.prototype.toString.call(iterator));