Avoid converting key to string for deleting of elements

test/mjsunit/messages.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.
 
 // Flags: --stack-size=100 --harmony --harmony-reflect --harmony-arrays
 // Flags: --harmony-regexps --strong-mode
 
 function test(f, expected, type) {
   try {
     f();
@@ skipping 387 matching lines @@
   "use strict";
   o;
 }, "o is not defined", ReferenceError);
 
 // === RangeError ===
 
 // kArrayLengthOutOfRange
 test(function() {
   "use strict";
   Object.defineProperty([], "length", { value: 1E100 });
-}, "defineProperty() array length out of range", RangeError);
+}, "Invalid array length", RangeError);
 
 // kInvalidArrayBufferLength
 test(function() {
   new ArrayBuffer(-1);
 }, "Invalid array buffer length", RangeError);
 
 // kInvalidArrayLength
 test(function() {
   [].length = -1;
 }, "Invalid array length", RangeError);
@@ skipping 43 matching lines @@
   Number(1).toString(100);
 }, "toString() radix argument must be between 2 and 36", RangeError);
 
 
 // === URIError ===
 
 // kURIMalformed
 test(function() {
   decodeURI("%%");
 }, "URI malformed", URIError);