Mark supportsPointConversions deprecated and always true rather than testing DOMPoint

tests/html/css_test.dart

 library CssTest;
+
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_individual_config.dart';
 import 'dart:html';
 
 main() {
   useHtmlIndividualConfiguration();
 
   group('supportsPointConversions', () {
     test('supported', () {
       expect(Window.supportsPointConversions, true);
     });
   });
 
   group('functional', () {
     test('DomPoint', () {
-      var expectation = Window.supportsPointConversions ?
-          returnsNormally : throws;
-      expect(() {
-        Element element = new Element.tag('div');
-        element.attributes['style'] =
-          '''
+      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);
           -moz-transform: translate3d(250px, 100px, 0px);
           ''';
-        document.body.append(element);
+      document.body.append(element);
 
-        var elemRect = element.getBoundingClientRect();
+      var elemRect = element.getBoundingClientRect();
 
-        checkPoint(250, 100, new Point(elemRect.left, elemRect.top));
-        checkPoint(310, 200, new Point(elemRect.right, elemRect.bottom));
-      }, expectation);
+      checkPoint(250, 100, new Point(elemRect.left, elemRect.top));
+      checkPoint(310, 200, new Point(elemRect.right, elemRect.bottom));
     });
   });
 }
 
 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');
 }