Remove more classes and members by making them private.

tests/html/element_types_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library element_types;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 
 main() {
@@ skipping 110 matching lines @@
     });
     test('div', () {
       expect((new DivElement()) is DivElement, true);
     });
     test('embed', () {
       expect((new EmbedElement()) is EmbedElement, EmbedElement.supported);
     });
     test('fieldset', () {
       expect((new FieldSetElement()) is FieldSetElement, true);
     });
-    test('font', () {
-      expect((new Element.tag('font')) is FontElement, true);
-    });
     test('form', () {
       expect((new FormElement()) is FormElement, true);
     });
-    test('frame', () {
-      expect((new Element.tag('frame')) is FrameElement, true);
-    });
-    test('frameset', () {
-      expect((new Element.tag('frameset')) is FrameSetElement, true);
-    });
     test('head', () {
       expect((new HeadElement()) is HeadElement, true);
     });
     test('hr', () {
       expect((new HRElement()) is HRElement, true);
     });
     test('html', () {
       expect((new HtmlElement()) is HtmlElement, true);
     });
     test('h1', () {
@@ skipping 40 matching lines @@
     });
     test('legend', () {
       expect((new LegendElement()) is LegendElement, true);
     });
     test('link', () {
       expect((new LinkElement()) is LinkElement, true);
     });
     test('map', () {
       expect((new MapElement()) is MapElement, true);
     });
-    test('marquee', () {
-      expect((new Element.tag('marquee')) is MarqueeElement,
-          MarqueeElement.supported);
-    });
     test('menu', () {
       expect((new MenuElement()) is MenuElement, true);
     });
     test('meta', () {
       expect((new Element.tag('meta')) is MetaElement, true);
     });
     test('meter', () {
       expect((new Element.tag('meter')) is MeterElement, MeterElement.supported);
     });
     test('del', () {
@@ skipping 84 matching lines @@
       expect((new UListElement()) is UListElement, true);
     });
     test('video', () {
       expect((new VideoElement()) is VideoElement, true);
     });
     test('unknown', () {
       expect((new Element.tag('someunknown')) is UnknownElement, true);
     });;
   });
 }