Fixing CharacterData.remove not working on FireFox.

tests/html/cdata_test.dart

Index: tests/html/cdata_test.dart
diff --git a/tests/html/cdata_test.dart b/tests/html/cdata_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..928cf3817f071b77d60b4e9dbc9ec9bad7d76b91
--- /dev/null
+++ b/tests/html/cdata_test.dart
@@ -0,0 +1,22 @@
+// Copyright (c) 2013, 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 cdata_test;
+import '../../pkg/unittest/lib/unittest.dart';
+import '../../pkg/unittest/lib/html_config.dart';
+import 'dart:html';
+
+
+main() {
+  test('remove', () {
+    var div = new Element.html('<div>content</div>');
+    var cdata = div.nodes[0];
+    expect(cdata is CharacterData, true);
+    expect(cdata, isNotNull);
+    expect(div.innerHtml, 'content');
+
+    cdata.remove();
+    expect(div.innerHtml, '');
+  });
+}