Merge the Sky Engine changes from the SkyDart branch

sky/tests/lowlevel/iframe.sky

Index: sky/tests/lowlevel/iframe.sky
diff --git a/sky/tests/lowlevel/iframe.sky b/sky/tests/lowlevel/iframe.sky
index 8c3682c3a386e91c2eb75d75bc6e5d10423696fe..b9d75546f51529a1e231c3eef2569a3a012fdecd 100644
--- a/sky/tests/lowlevel/iframe.sky
+++ b/sky/tests/lowlevel/iframe.sky
@@ -1,12 +1,15 @@
 <sky>
-    <import src="../resources/dump-as-render-tree.sky" />
+    <import src="../resources/dump-as-render-tree.sky"/>
     <iframe id="removeMe" src="text.sky">Should not render</iframe>
     <div>This is an <iframe style="border-style: solid; border-width: 20px" src="abarth.sky">iframe</iframe> element.</div>
     <div style="height: 200px">Placeholder.</div>
     <div>Small iframe should render <iframe style="height: 40px" src="abarth.sky">iframe</iframe> correctly.</div>
 
     <script>
-        var removeMe = document.getElementById("removeMe");
-        removeMe.parentNode.removeChild(removeMe);
+    import "dart:sky";
+
+    void main() {
+        document.getElementById("removeMe").remove();
+    }
     </script>
 </sky>