[es6] Unify ArrayBuffer and SharedArrayBuffer constructors.

src/js/arraybuffer.js

 // Copyright 2013 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.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
 // Imports
 
 var GlobalArrayBuffer = global.ArrayBuffer;
-var GlobalObject = global.Object;
 var MakeTypeError;
 var MaxSimple;
 var MinSimple;
-var ToPositiveInteger;
-var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
   MakeTypeError = from.MakeTypeError;
   MaxSimple = from.MaxSimple;
   MinSimple = from.MinSimple;
-  ToPositiveInteger = from.ToPositiveInteger;
 });
 
 // -------------------------------------------------------------------
 
-function ArrayBufferConstructor(length) { // length = 1
-  if (!IS_UNDEFINED(new.target)) {
-    var byteLength = ToPositiveInteger(length, kInvalidArrayBufferLength);
-    %ArrayBufferInitialize(this, byteLength, kNotShared);
-  } else {
-    throw MakeTypeError(kConstructorNotFunction, "ArrayBuffer");
-  }
-}
-
 function ArrayBufferGetByteLen() {
   if (!IS_ARRAYBUFFER(this)) {
     throw MakeTypeError(kIncompatibleMethodReceiver,
                         'ArrayBuffer.prototype.byteLength', this);
   }
   return %_ArrayBufferGetByteLength(this);
 }
 
 // ES6 Draft 15.13.5.5.3
 function ArrayBufferSlice(start, end) {
@@ skipping 25 matching lines @@
     fin = first;
   }
   var newLen = fin - first;
   // TODO(dslomov): implement inheritance
   var result = new GlobalArrayBuffer(newLen);
 
   %ArrayBufferSliceImpl(this, result, first);
   return result;
 }
 
-function ArrayBufferIsViewJS(obj) {
-  return %ArrayBufferIsView(obj);
-}
-
-
-// Set up the ArrayBuffer constructor function.
-%SetCode(GlobalArrayBuffer, ArrayBufferConstructor);
-%FunctionSetPrototype(GlobalArrayBuffer, new GlobalObject());
-
-// Set up the constructor property on the ArrayBuffer prototype object.
-%AddNamedProperty(
-    GlobalArrayBuffer.prototype, "constructor", GlobalArrayBuffer, DONT_ENUM);
-
-%AddNamedProperty(GlobalArrayBuffer.prototype,
-    toStringTagSymbol, "ArrayBuffer", DONT_ENUM | READ_ONLY);
-
 utils.InstallGetter(GlobalArrayBuffer.prototype, "byteLength",
                     ArrayBufferGetByteLen);
 
-utils.InstallFunctions(GlobalArrayBuffer, DONT_ENUM, [
-  "isView", ArrayBufferIsViewJS
-]);
-
 utils.InstallFunctions(GlobalArrayBuffer.prototype, DONT_ENUM, [
   "slice", ArrayBufferSlice
 ]);
 
 })