Process Custom Elements in post-order.

LayoutTests/fast/dom/custom/lifecycle-created-paste.html

Index: LayoutTests/fast/dom/custom/lifecycle-created-paste.html
diff --git a/LayoutTests/fast/dom/custom/lifecycle-created-paste.html b/LayoutTests/fast/dom/custom/lifecycle-created-paste.html
index 2e0e83b0cadc97cd9024429a23bb4438398b60bb..95eea472e1964b3eabfe90b787fc25e11aa39699 100644
--- a/LayoutTests/fast/dom/custom/lifecycle-created-paste.html
+++ b/LayoutTests/fast/dom/custom/lifecycle-created-paste.html
@@ -17,10 +17,10 @@ var selection = window.getSelection();
 selection.selectAllChildren(container);
 document.execCommand("Copy");
 
-shouldBe("window.callbacksCalled", "['DIV', 'X-FOO']");
+shouldBe("window.callbacksCalled", "['X-FOO', 'DIV']");
 selection.collapseToEnd();
 document.execCommand("Paste");
-shouldBe("window.callbacksCalled", "['DIV', 'X-FOO', 'DIV', 'X-FOO']");
+shouldBe("window.callbacksCalled", "['X-FOO', 'DIV', 'X-FOO', 'DIV']");
 
 container.style.display = "none";
 </script>