Modify and enable formerly disabled test.

tests/html/node_test.dart

Index: tests/html/node_test.dart
diff --git a/tests/html/node_test.dart b/tests/html/node_test.dart
index 860007298c37d00be77138d00182d3062d492634..44bd28efa5cb52220f067bf172d891f12cd1c116 100644
--- a/tests/html/node_test.dart
+++ b/tests/html/node_test.dart
@@ -27,12 +27,11 @@ main() {
     Expect.isTrue(node.nodes[2] is Comment);
   });
 
-  if (false) // TODO(antonm): fix it.
   test('remove', () {
     final node = makeNodeWithChildren();
     final subnode = node.nodes[1];
     final out = subnode.remove();
-    Expect.equals(subnode, out, '#remove should be chainable');
+    Expect.isNull(out);
     Expect.equals(2, node.nodes.length);
     Expect.isTrue(node.nodes[0] is Text);
     Expect.isTrue(node.nodes[1] is Comment);