Removing CssValue APIs

tests/html/css_test.dart

 library CssTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 
 main() {
   useHtmlIndividualConfiguration();
 
-  group('supported_CssMatrix', () {
+  group('supportsPointConversions', () {
     test('supported', () {
-      expect(CssMatrix.supported, true);
-    });
-  });
-
-  group('supported_DomPoint', () {
-    test('supported', () {
-      expect(DomPoint.supported, true);
+      expect(Window.supportsPointConversions, true);
     });
   });
 
   group('functional', () {
-    test('CssMatrix', () {
-      var expectation = CssMatrix.supported ? returnsNormally : throws;
-      expect(() {
-        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)');
-        expect(matrix2.a.round(), equals(1));
-        expect(matrix2.e.round(), equals(-835));
-      }, expectation);
-    });
     test('DomPoint', () {
-      var expectation = DomPoint.supported ? returnsNormally : throws;
+      var expectation = Window.supportsPointConversions ?
+          returnsNormally : throws;
       expect(() {
         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);
           ''';
         document.body.nodes.add(element);
 
-        DomPoint point = new DomPoint(5, 2);
+        Point point = new Point(5, 2);
         checkPoint(5, 2, point);
         checkPoint(255, 102, window.convertPointFromNodeToPage(element, point));
-        point.y = 100;
+        point = new Point(5, 100);
         checkPoint(5, 100, point);
         checkPoint(255, 200, window.convertPointFromNodeToPage(element, point));
       }, expectation);
     });
   });
 }
 
-void checkPoint(expectedX, expectedY, DomPoint 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');
 }