Remove old tests that have been migrated to the v8 repo.

LayoutTests/fast/js/script-tests/array-slow-put.js

-description(
-"Tests that defining a setter on the Array prototype works."
-);
-
-var ouches = 0;
-Array.prototype.__defineSetter__("3", function() { debug("Ouch!"); ouches++; });
-
-function foo() {
-    var result = [];
-    result.length = 5;
-    for (var i = 0; i < result.length; ++i)
-        result[i] = i;
-    return result;
-}
-
-for (var i = 0; i < 100; ++i)
-    shouldBe("\"" + foo().join(",") + "\"", "\"0,1,2,,4\"");
-
-shouldBe("ouches", "100");