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

LayoutTests/fast/js/script-tests/object-prototype-toLocaleString.js

-description(
-'Tests: Object.prototype.toLocaleString(). Related bug: <a href="https://bugs.webkit.org/show_bug.cgi?id=3989">3989 JSC doesn\'t implement Object.prototype.toLocaleString()</a>'
-);
-
-var o = new Object();
-shouldBe("o.toLocaleString()", "o.toString()");
-o.toLocaleString = function () { return "Dynamic toLocaleString()"; }
-shouldBe("o.toLocaleString()", '"Dynamic toLocaleString()"');
-
-shouldBe("Object.prototype.toLocaleString.call('Hello, world!')", '"Hello, world!"');
-
-var stringPrototypeToString = String.prototype.toString;
-String.prototype.toString = (function(){ return "stringPrototypeToString"; });
-shouldBe("Object.prototype.toLocaleString.call('Hello, world!')", '"stringPrototypeToString"');
-String.prototype.toString = stringPrototypeToString;