Use ES2015-style TypedArray prototype chain

test/mjsunit/es6/typed-array-iterator.js

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 var constructors = [Uint8Array, Int8Array,
                     Uint16Array, Int16Array,
                     Uint32Array, Int32Array,
                     Float32Array, Float64Array,
                     Uint8ClampedArray];
 
-function TestTypedArrayPrototype(constructor) {
-  assertTrue(constructor.prototype.hasOwnProperty('entries'));
-  assertTrue(constructor.prototype.hasOwnProperty('values'));
-  assertTrue(constructor.prototype.hasOwnProperty('keys'));
-  assertTrue(constructor.prototype.hasOwnProperty(Symbol.iterator));
+var TypedArrayPrototype = Uint8Array.prototype.__proto__;
 
-  assertFalse(constructor.prototype.propertyIsEnumerable('entries'));
-  assertFalse(constructor.prototype.propertyIsEnumerable('values'));
-  assertFalse(constructor.prototype.propertyIsEnumerable('keys'));
-  assertFalse(constructor.prototype.propertyIsEnumerable(Symbol.iterator));
+assertTrue(TypedArrayPrototype.hasOwnProperty('entries'));
+assertTrue(TypedArrayPrototype.hasOwnProperty('values'));
+assertTrue(TypedArrayPrototype.hasOwnProperty('keys'));
+assertTrue(TypedArrayPrototype.hasOwnProperty(Symbol.iterator));
 
-  assertEquals(Array.prototype.entries, constructor.prototype.entries);
-  assertEquals(Array.prototype[Symbol.iterator], constructor.prototype.values);
-  assertEquals(Array.prototype.keys, constructor.prototype.keys);
-  assertEquals(Array.prototype[Symbol.iterator], constructor.prototype[Symbol.iterator]);
-}
-constructors.forEach(TestTypedArrayPrototype);
+assertFalse(TypedArrayPrototype.propertyIsEnumerable('entries'));
+assertFalse(TypedArrayPrototype.propertyIsEnumerable('values'));
+assertFalse(TypedArrayPrototype.propertyIsEnumerable('keys'));
+assertFalse(TypedArrayPrototype.propertyIsEnumerable(Symbol.iterator));
+
+assertEquals(Array.prototype.entries, TypedArrayPrototype.entries);
+assertEquals(Array.prototype[Symbol.iterator], TypedArrayPrototype.values);
+assertEquals(Array.prototype.keys, TypedArrayPrototype.keys);
+assertEquals(Array.prototype[Symbol.iterator], TypedArrayPrototype[Symbol.iterator]);
 
 
 function TestTypedArrayValues(constructor) {
   var array = [1, 2, 3];
   var i = 0;
   for (var value of new constructor(array)) {
     assertEquals(array[i++], value);
   }
   assertEquals(i, array.length);
 }
 constructors.forEach(TestTypedArrayValues);