Replace createTextNode with new Text().

sky/benchmarks/dom/creation.sky

 <sky>
 <import src="../resources/runner.sky" as="PerfRunner" />
 <script>
 var sky = document.querySelector("sky");
 
 var widgets = 0;
 var basicElements = 0;
 var texts = 0;
 
 var WidgetPrototype = Object.create(HTMLElement.prototype);
@@ skipping 26 matching lines @@
   prototype: WidgetPrototype,
 });
 
 function createElement(tagName) {
   basicElements++;
   return document.createElement(tagName);
 }
 
 function createText(text) {
   texts++;
-  return document.createTextNode(text);
+  return new Text(text);
 }
 
 function createElements(root, depth) {
   for (var i = 0; i < 4; i++) {
     var div = createElement("div");
     var span1 = div.appendChild(createElement("span"));
     span1.appendChild(createText("foo"));
     span1.setAttribute("id", "span" + (i * depth));
     div.appendChild(createText(" "));
     div.setAttribute("class", "b" + i + " a" + i);
@@ skipping 27 matching lines @@
   // console.log("widgets: " + widgets);
   // console.log("basic elements: " + basicElements);
   // console.log("texts: " + texts);
   // CONSOLE: LOG: widgets: 340
   // CONSOLE: LOG: basic elements: 1021
   // CONSOLE: LOG: texts: 1020
   done();
 });
 </script>
 </sky>