[es6] Map/Set size getter should have "get size" name

test/mjsunit/es6/built-in-accessor-names.js

+// Copyright 2015 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.
+
+'use strict';
+
+function assertGetterName(expected, object, name) {
+  var descr = Object.getOwnPropertyDescriptor(object, name);
+  assertSame(expected, descr.get.name);
+}
+
+
+function assertSetterName(expected, object, name) {
+  var descr = Object.getOwnPropertyDescriptor(object, name);
+  assertSame(expected, descr.set.name);
+}
+
+
+assertGetterName('get byteLength', ArrayBuffer.prototype, 'byteLength');
+assertGetterName('get size', Set.prototype, 'size');
+assertGetterName('get size', Map.prototype, 'size');
+
+
+let typedArrays = [
+  Uint8Array,
+  Int8Array,
+  Uint16Array,
+  Int16Array,
+  Uint32Array,
+  Int32Array,
+  Float32Array,
+  Float64Array,
+  Uint8ClampedArray
+];
+
+for (let f of typedArrays) {
+  assertGetterName('get buffer', f.prototype, 'buffer');
+  assertGetterName('get byteOffset', f.prototype, 'byteOffset');
+  assertGetterName('get byteLength', f.prototype, 'byteLength');
+  assertGetterName('get length', f.prototype, 'length');
+  assertGetterName('get [Symbol.toStringTag]', f.prototype, Symbol.toStringTag);
+}
+
+
+assertGetterName('get buffer', DataView.prototype, 'buffer');
+assertGetterName('get byteOffset', DataView.prototype, 'byteOffset');
+assertGetterName('get byteLength', DataView.prototype, 'byteLength');
+
+
+assertGetterName('get __proto__', Object.prototype, '__proto__');
+assertSetterName('set __proto__', Object.prototype, '__proto__');