Remove duplicate third-party test cases.

test/mjsunit/third_party/array-isarray.js

-// Copyright (c) 2009 Apple Computer, Inc. All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions
-// are met:
-//
-// 1. Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//
-// 2. Redistributions in binary form must reproduce the above
-// copyright notice, this list of conditions and the following
-// disclaimer in the documentation and/or other materials provided
-// with the distribution.
-//
-// 3. Neither the name of the copyright holder(s) nor the names of any
-// contributors may be used to endorse or promote products derived
-// from this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
-// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
-// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
-// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
-// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
-// OF THE POSSIBILITY OF SUCH DAMAGE.
-
-// Based on LayoutTests/fast/js/resources/Array-isArray.js
-
-assertTrue(Array.isArray([]));
-assertTrue(Array.isArray(new Array));
-assertTrue(Array.isArray(Array()));
-assertTrue(Array.isArray('abc'.match(/(a)*/g)));
-assertFalse((function(){ return Array.isArray(arguments); })());
-assertFalse(Array.isArray());
-assertFalse(Array.isArray(null));
-assertFalse(Array.isArray(undefined));
-assertFalse(Array.isArray(true));
-assertFalse(Array.isArray(false));
-assertFalse(Array.isArray('a string'));
-assertFalse(Array.isArray({}));
-assertFalse(Array.isArray({length: 5}));
-assertFalse(Array.isArray({__proto__: Array.prototype, length:1, 0:1, 1:2}));
-