Migrate dom tests to dart:html.

client/tests/client/dom/CanvasUsingHtmlTest.dart

Index: client/tests/client/dom/CanvasUsingHtmlTest.dart
diff --git a/client/tests/client/dom/CanvasUsingHtmlTest.dart b/client/tests/client/dom/CanvasUsingHtmlTest.dart
index 3d924edfdbb8c598e00dc3376f491918462a4ac2..48ff1669ee8d3f5f35eeea4b24638594509cd620 100644
--- a/client/tests/client/dom/CanvasUsingHtmlTest.dart
+++ b/client/tests/client/dom/CanvasUsingHtmlTest.dart
@@ -1,22 +1,22 @@
 #library('CanvasUsingHtmlTest');
 #import('../../../../lib/unittest/unittest.dart');
-#import('../../../../lib/unittest/dom_config.dart');
+#import('../../../../lib/unittest/html_config.dart');
 #import('dart:html', prefix: 'html');
-#import('dart:dom');
+#import('dart:html');
 
 // Version of Canvas test that implicitly uses dart:html library via unittests.
 
 main() {
-  HTMLCanvasElement canvas;
+  CanvasElement canvas;
   CanvasRenderingContext2D context;
 
-  canvas = document.createElement('canvas');
-  canvas.setAttribute('width', '100');
-  canvas.setAttribute('height', '100');
-  document.body.appendChild(canvas);
+  canvas = new Element.tag('canvas');
+  canvas.attributes['width'] = '100';
+  canvas.attributes['height'] = '100';
+  document.body.nodes.add(canvas);
   context = canvas.getContext('2d');
 
-  useDomConfiguration();
+  useHtmlConfiguration();
   test('FillStyle', () {
     context.fillStyle = "red";
     context.fillRect(10, 10, 20, 20);