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..75d96564e1e405e8f0eda85cf301e29008754270 100644
--- a/LayoutTests/fast/dom/script-tests/webtiming-document-open.js
+++ b/LayoutTests/fast/dom/script-tests/webtiming-document-open.js
@@ -27,9 +27,13 @@ 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 = [];

[jsbell, 2015/01/21 18:09:39]

This pattern repeats often. Perhaps we should add to js-test.js:

function getAllPropertyNames(o) {
  var ps = [];
  for (var p in o)
    ps.push(p);
  ps.sort();
  return ps;
}

[Yuki, 2015/01/22 06:53:29]

Done.

+    for (property in timing) {
+        properties.push(property);
+    }
+    properties.sort();
+    for (var i = 0; i < properties.length; ++i) {
+        shouldBe("timing." + properties[i], "originalTiming." + properties[i]);
     }
 
     finishJSTest();