[bindings] Avoid using custom binding for HTMLOptionsCollection.length attribute

LayoutTests/fast/dom/HTMLSelectElement/select-selectedIndex.html

 <select id="test" size="3">
 </select>
 <div id="console"></div>
 <script src="../../../resources/js-test.js"></script>
 <script>
 function reset(mySelect) {
     mySelect.length = 0;
     mySelect.options[mySelect.length] = new Option("one", "value", true, true);
     mySelect.options[mySelect.length] = new Option("two", "value", true, true);
 }
 
 var mySelect = document.getElementById("test");
 reset(mySelect);
 var i = 0;
 
 debug((++i) + ") setting length to a negative length");
-shouldThrow("mySelect.options.length = -1;");
+mySelect.options.length = -1;
 shouldBe("mySelect.options.length", "2");
 shouldBe("mySelect.selectedIndex", "1");
 
 debug((++i) + ") setting length to a larger length");
 mySelect.options.length = 5;
 shouldBe("mySelect.options.length", "5");
 shouldBe("mySelect.selectedIndex", "1");
 
 debug((++i) + ") setting length to a smaller length");
 mySelect.options.length = 2;
@@ skipping 107 matching lines @@
 debug((++i) + ") trying to set a option element using an invalid index: positive infinity");
 mySelect.options[1/0] = document.createElement("option");
 shouldBe("mySelect.options.length", "10");
 shouldBe("mySelect.selectedIndex", "-1");
 
 debug((++i) + ") trying to add a non-option element");
 shouldThrow("mySelect.options.add({})");
 shouldBe("mySelect.options.length", "10");
 shouldBe("mySelect.selectedIndex", "-1");
 
+debug((++i) + ") setting length to a value greater than 10000");
+mySelect.options.length = 10001;
+shouldBe("mySelect.options.length", "10");
+shouldBe("mySelect.selectedIndex", "-1");
+
 debug("");
 </script>