Remove a test that times out.

Remove a test that times out.

Rubber stamped by Mark Hahnenberg.

This test times out for me, every time. It tests code that has since been rewritten
and has had new tests added to cover it. It's not clear that this test would be
useful anymore even if we made it not timeout.

* fast/js/array-sort-modifying-tostring-expected.txt: Removed.
* fast/js/array-sort-modifying-tostring.html: Removed.
* fast/js/script-tests/array-sort-modifying-tostring.js: Removed.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@154135 268f45cc-cd09-0410-ab3c-d52691b4dbfc