Remove redundant test

test/built-ins/JSON/stringify/15.12.3-11-26.js

-// Copyright (c) 2012 Ecma International.  All rights reserved.
-// This code is governed by the BSD license found in the LICENSE file.
-
-/*---
-es5id: 15.12.3-11-26
-description: >
-    JSON.stringify - the last element of the concatenation is ']' (The
-    abstract operation JA(value) step 10.b.iii)
----*/
-
-var arrObj = [];
-arrObj[0] = "a";
-arrObj[1] = "b";
-arrObj[2] = "c";
-
-var jsonText = JSON.stringify(arrObj, undefined, "").toString();
-
-assert.sameValue(jsonText.charAt(jsonText.length - 1), "]", 'jsonText.charAt(jsonText.length - 1)');