Dartifying dart:html type names.

tests/html/css_test.dart

-library CSSTest;
+library CssTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
 
 main() {
   useHtmlConfiguration();
-  test('CSSMatrix', () {
-    CSSMatrix matrix1 = new CSSMatrix();
+  test('CssMatrix', () {
+    CssMatrix matrix1 = new CssMatrix();
     expect(matrix1.m11.round(), equals(1));
     expect(matrix1.m12.round(), isZero);
 
-    CSSMatrix matrix2 = new CSSMatrix('matrix(1, 0, 0, 1, -835, 0)');
+    CssMatrix matrix2 = new CssMatrix('matrix(1, 0, 0, 1, -835, 0)');
     expect(matrix2.a.round(), equals(1));
     expect(matrix2.e.round(), equals(-835));
   });
   test('Point', () {
     Element element = new Element.tag('div');
     element.attributes['style'] =
       '''
       position: absolute;
       width: 60px;
       height: 100px;
@@ skipping 10 matching lines @@
     point.y = 100;
     checkPoint(5, 100, point);
     checkPoint(254, 196, window.webkitConvertPointFromNodeToPage(element, point));
   });
 }
 
 void checkPoint(expectedX, expectedY, Point point) {
   expect(point.x.round(), equals(expectedX), reason: 'Wrong point.x');
   expect(point.y.round(), equals(expectedY), reason: 'Wrong point.y');
 }