Migrate dom tests to dart:html.

tests/dom/css_test.dart

 #library('CSSTest');
 #import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/dom_config.dart');
-#import('dart:dom');
+#import('../../lib/unittest/html_config.dart');
+#import('dart:html');
 
 main() {
-  useDomConfiguration();
-  test('WebKitCSSMatrix', () {
-    WebKitCSSMatrix matrix1 = new WebKitCSSMatrix();
+  useHtmlConfiguration();
+  test('CSSMatrix', () {
+    CSSMatrix matrix1 = new CSSMatrix();
     Expect.equals(1, matrix1.m11.round());
     Expect.equals(0, matrix1.m12.round());
 
-    WebKitCSSMatrix matrix2 = new WebKitCSSMatrix('matrix(1, 0, 0, 1, -835, 0)');
+    CSSMatrix matrix2 = new CSSMatrix('matrix(1, 0, 0, 1, -835, 0)');
     Expect.equals(1, matrix2.a.round());
     Expect.equals(-835, matrix2.e.round());
   });
-  test('WebKitPoint', () {
-    HTMLElement element = document.createElement('div');
-    element.setAttribute('style',
+  test('Point', () {
+    Element element = new Element.tag('div');
+    element.attributes['style'] =
       '''
       position: absolute;
       width: 60px;
       height: 100px;
       left: 0px;
       top: 0px;
       background-color: red;
       -webkit-transform: translate3d(250px, 100px, 0px) perspective(500px) rotateX(30deg);
-      ''');
-    document.body.appendChild(element);
+      ''';
+    document.body.nodes.add(element);
 
-    WebKitPoint point = new WebKitPoint(5, 2);
+    Point point = new Point(5, 2);
     checkPoint(5, 2, point);
     checkPoint(256, 110, window.webkitConvertPointFromNodeToPage(element, point));
     point.y = 100;
     checkPoint(5, 100, point);
     checkPoint(254, 196, window.webkitConvertPointFromNodeToPage(element, point));
   });
 }
 
-void checkPoint(expectedX, expectedY, WebKitPoint point) {
+void checkPoint(expectedX, expectedY, Point point) {
   Expect.equals(expectedX, point.x.round(), 'Wrong point.x');
   Expect.equals(expectedY, point.y.round(), 'Wrong point.y');
 }