Use import/export for more functions (instead of js builtins object).

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 MathMax;
 var MathMin;
+var ToPositiveInteger;
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
   MathMax = from.MathMax;
   MathMin = from.MathMin;
+  ToPositiveInteger = from.ToPositiveInteger;
 });
 
 // -------------------------------------------------------------------
 
 function ArrayBufferConstructor(length) { // length = 1
   if (%_IsConstructCall()) {
-    var byteLength = $toPositiveInteger(length, kInvalidArrayBufferLength);
+    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);
@@ skipping 59 matching lines @@
 
 utils.InstallFunctions(GlobalArrayBuffer, DONT_ENUM, [
   "isView", ArrayBufferIsViewJS
 ]);
 
 utils.InstallFunctions(GlobalArrayBuffer.prototype, DONT_ENUM, [
   "slice", ArrayBufferSlice
 ]);
 
 })