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

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

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