Follow Safari and Firefox in returning empty array from array splice...

test/mjsunit/third_party/array-splice-webkit.js

 // Copyright (c) 2006 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
@@ skipping 20 matching lines @@
 
 // Simple splice tests based on webkit layout tests.
 var arr = ['a','b','c','d'];
 assertArrayEquals(['a','b','c','d'], arr);
 assertArrayEquals(['c','d'], arr.splice(2));
 assertArrayEquals(['a','b'], arr);
 assertArrayEquals(['a','b'], arr.splice(0));
 assertArrayEquals([], arr)
 
 arr = ['a','b','c','d'];
-assertEquals(undefined, arr.splice())
+assertEquals([], arr.splice())
 assertArrayEquals(['a','b','c','d'], arr);
 assertArrayEquals(['a','b','c','d'], arr.splice(undefined))
 assertArrayEquals([], arr);
 
 arr = ['a','b','c','d'];
 assertArrayEquals(['a','b','c','d'], arr.splice(null))
 assertArrayEquals([], arr);
 
 arr = ['a','b','c','d'];
 assertArrayEquals([], arr.splice(100))
 assertArrayEquals(['a','b','c','d'], arr);
 assertArrayEquals(['d'], arr.splice(-1))
 assertArrayEquals(['a','b','c'], arr);
 
 assertArrayEquals([], arr.splice(2, undefined))
 assertArrayEquals([], arr.splice(2, null))
 assertArrayEquals([], arr.splice(2, -1))
 assertArrayEquals([], arr.splice(2, 0))
 assertArrayEquals(['a','b','c'], arr);
 assertArrayEquals(['c'], arr.splice(2, 100))
 assertArrayEquals(['a','b'], arr);