The index argument for HTMLCollection item() api should not be optional

LayoutTests/fast/dom/html-collections-named-getter-mandatory-arg.html

Index: LayoutTests/fast/dom/html-collections-named-getter-mandatory-arg.html
diff --git a/LayoutTests/fast/dom/html-collections-named-getter-mandatory-arg.html b/LayoutTests/fast/dom/html-collections-named-getter-mandatory-arg.html
index 596a33482eda8b525c8999d8fe44cf9156657da0..21935b93320283e031f36c67109b854e0541a3ca 100644
--- a/LayoutTests/fast/dom/html-collections-named-getter-mandatory-arg.html
+++ b/LayoutTests/fast/dom/html-collections-named-getter-mandatory-arg.html
@@ -12,6 +12,7 @@ shouldBe("htmlCollection.__proto__", "HTMLCollection.prototype");
 shouldBe("htmlCollection.length", "1");
 shouldBe("htmlCollection.namedItem('testLink')", "testLink");
 shouldThrow("htmlCollection.namedItem()", '"TypeError: Failed to execute \'namedItem\' on \'HTMLCollection\': 1 argument required, but only 0 present."');
+shouldThrow("htmlCollection.item()", '"TypeError: Failed to execute \'item\' on \'HTMLCollection\': 1 argument required, but only 0 present."');

[philipj_slow, 2015/07/20 07:21:33]

"This test verifies that HTMLCollection.namedItem() argument is mandatory"

Given that
LayoutTests/fast/dom/non-numeric-values-numeric-parameters-expected.txt already
verifies the behavior, just revert the changes to this test.

[shiva.jm, 2015/07/20 09:55:54]

Done.

 </script>
 </body>
 </html>