Port DocumentFragment to the new wrapperless DOM.

client/tests/client/html/html_tests.dart

Index: client/tests/client/html/html_tests.dart
diff --git a/client/tests/client/html/html_tests.dart b/client/tests/client/html/html_tests.dart
index 312af61e0fc648db9ba16be68599c7901f705647..4b1591003d56641b8c160c6f37ca953363521d07 100644
--- a/client/tests/client/html/html_tests.dart
+++ b/client/tests/client/html/html_tests.dart
@@ -9,7 +9,7 @@
 
 #source('util.dart');
 #source('CSSStyleDeclarationTests.dart');
-// #source('DocumentFragmentTests.dart');
+#source('DocumentFragmentTests.dart');
 #source('ElementTests.dart');
 // #source('EventTests.dart');
 #source('LocalStorageTests.dart');
@@ -20,8 +20,7 @@
 
 main() {
   group('CSSStyleDeclaration', testCSSStyleDeclaration);
-  // TODO(nwiez): enable once DocumentFragment is ready -- Dart issue 1998.
-  // group('DocumentFragment', testDocumentFragment);
+  group('DocumentFragment', testDocumentFragment);
   group('Element', testElement);
   // TODO(nweiz): enable once event constructors are ported -- Dart issue 1996.
   // group('Event', testEvents);