Replace createTextNode with new Text().

Sky doesn't have this method (per spec).

R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/879733002

engine/src/flutter/benchmarks/dom/creation.sky

@@ -44,7 +44,7 @@ function createElement(tagName) {
 
 function createText(text) {
   texts++;
-  return document.createTextNode(text);
+  return new Text(text);
 }
 
 function createElements(root, depth) {

engine/src/flutter/benchmarks/layout/simple-blocks.sky

@@ -15,9 +15,9 @@ var content = document.getElementById('content');
 var out = [];
 for (var i = 0; i < 1000; i++) {
   var div = document.createElement('div');
-  div.appendChild(document.createElement('span')).appendChild(document.createTextNode('foo'));
+  div.appendChild(document.createElement('span')).appendChild(new Text('foo'));
-  div.appendChild(document.createTextNode(' '));
+  div.appendChild(new Text(' '));
-  div.appendChild(document.createElement('span')).appendChild(document.createTextNode('bar'));
+  div.appendChild(document.createElement('span')).appendChild(new Text('bar'));
   content.appendChild(div);
 }
 

engine/src/flutter/tests/editing/delete_block_contents.sky

@@ -9,9 +9,9 @@ describe("height of an editable block", function() {
     var elem = document.getElementById("test");
     var originalHeight = elem.offsetHeight;
     var d = elem.appendChild(document.createElement('div'));
-    d.appendChild(document.createTextNode('aaa'));
+    d.appendChild(new Text('aaa'));
     d = elem.appendChild(document.createElement('div'));
-    d.appendChild(document.createTextNode('bbb'));
+    d.appendChild(new Text('bbb'));
     var newHeight = elem.offsetHeight;
 
     while (elem.firstChild) {

engine/src/flutter/tests/mutation-observer/delivery-order.sky

@@ -28,7 +28,7 @@ describe('MutationObserver', function() {
         observers[6].observe(div, {characterData: true, subtree: true});
         observers[8].observe(div, {attributes: true});
         div.setAttribute('foo', 'bar');
-        div.appendChild(document.createTextNode('hello'));
+        div.appendChild(new Text('hello'));
         div.firstChild.textContent = 'goodbye';
         setTimeout(function() {
             assert.deepEqual(order, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);

engine/src/flutter/tests/mutation-observer/mutation-callback-non-element-crash.sky

@@ -9,7 +9,7 @@ function mutationCallback(mutations, observer) {
 var mutationObserver = new MutationObserver(mutationCallback);
 var body = document.getElementById("body");
 mutationObserver.observe(body, {childList: true});
-body.appendChild(document.createTextNode("PASS. We didn't crash"));
+body.appendChild(new Text("PASS. We didn't crash"));
 </script>
 </body>
 </html>

engine/src/flutter/tests/mutation-observer/mutation-record-nullity.sky

@@ -7,7 +7,7 @@ describe('Non-relevant properties on mutation records should be null, except for
   var observer = new MutationObserver(function() {});
 
   it('on characterData records', function() {
-    var text = document.createTextNode('something');
+    var text = new Text('something');
     observer.observe(text, {characterData: true});
     text.data = 'something else';
     var record = observer.takeRecords()[0];

engine/src/flutter/tests/mutation-observer/observe-characterdata.sky

@@ -41,7 +41,7 @@ describe('MutationObserver on character data', function() {
             // ...observer.disconnect() should prevent further delivery of mutations.
 
             assert.equal(mutations, null);
-            charDataNode = document.createTextNode('');
+            charDataNode = new Text('');
             observer.observe(charDataNode, { characterData: true });
             charDataNode.textContent = 'foo';
             charDataNode.textContent = 'bar';

engine/src/flutter/tests/mutation-observer/observe-options-character-data.sky

@@ -5,7 +5,7 @@
 describe('Test MutationObserver.observe', function() {
   it('should respect character data options', function() {
     var observer = new MutationObserver(function() {});
-    var text = document.createTextNode('0');
+    var text = new Text('0');
 
     observer.observe(text, {characterDataOldValue: true});
     text.data = '1';

engine/src/flutter/tests/mutation-observer/shadow-dom.sky

@@ -7,7 +7,7 @@ describe('MutationObservers', function() {
   it('should handle shadow dom', function() {
     function mutate(element) {
       element.setAttribute('data-foo', 'bar');
-      element.insertBefore(document.createTextNode('hello'), element.firstChild);
+      element.insertBefore(new Text('hello'), element.firstChild);
       element.firstChild.textContent = 'goodbye';
       element.removeChild(element.firstChild);
     }