[binding] Check own property on named property accessor

LayoutTests/fast/dom/script-tests/collection-item-should-be-overridden-by-own-property.js

+description("This test ensures the collection item obtained by named property getter is overridden by object's own property.");
+
+var form = document.all;
+var select = document.querySelector('select');
+var table = document.querySelector('table');
+shouldBe("document.all.foo", "document.getElementById('element0')");
+document.all.foo = 1;
+shouldBe("document.all.foo", "1");
+
+shouldBe("document.styleSheets.link1", "document.styleSheets[0]");
+document.styleSheets.link1 = 1;
+shouldBe("document.styleSheets.link1", "1");
+
+shouldBe("document.body.attributes.style", "document.body.attributes['style']");
+document.body.attributes.style = 1;
+shouldBe("document.body.attributes.style", "1");
+
+
+document.getElementById('testElements').style.display = 'none';
+
+var successfullyParsed = true;
+