bindings: Fixes layouttests when moving attributes to prototype chains.

LayoutTests/fast/dom/script-tests/webtiming-document-open.js

Index: LayoutTests/fast/dom/script-tests/webtiming-document-open.js
diff --git a/LayoutTests/fast/dom/script-tests/webtiming-document-open.js b/LayoutTests/fast/dom/script-tests/webtiming-document-open.js
index 70c97dcec1e73051cb31ddf4ac1f89a67e653f40..52d949880f8a5f1754bb48fd1cd786f27eeb77c3 100644
--- a/LayoutTests/fast/dom/script-tests/webtiming-document-open.js
+++ b/LayoutTests/fast/dom/script-tests/webtiming-document-open.js
@@ -27,9 +27,9 @@ function testTimingWithDocumentOpen()
 }
 
 function finishTest() {
-    keys = Object.keys(timing).sort();
-    for (var i = 0; i < keys.length; ++i) {
-        shouldBe("timing." + keys[i], "originalTiming." + keys[i]);
+    var properties = getAllPropertyNames(timing);
+    for (var i = 0; i < properties.length; ++i) {
+        shouldBe("timing." + properties[i], "originalTiming." + properties[i]);
     }
 
     finishJSTest();