Things to unfork.

LayoutTests/dart/dom/HiddenDom2.dart

-#import('../../../../../dart/client/testing/unittest/unittest.dart');
-#import('dart:html');
-
-// Test that the dart:html API does not leak native jsdom methods:
-//   appendChild operation.
-
-main() {
-  forLayoutTests();
-
-  test('test1', () {
-    document.body.elements.add(new Element.html(@'''
-<div id='div1'>
-Hello World!
-</div>'''));
-    Element e = document.query('#div1');
-    Element e2 = new Element.html(@"<div id='xx'>XX</div>");
-    Expect.isTrue(e != null);
-
-    checkNoSuchMethod(() { confuse(e).appendChild(e2); });
-
-  });
-}
-
-class Decoy {
-  void appendChild(x) { throw 'dead code'; }
-}
-
-confuse(x) => opaqueTrue() ? x : (opaqueTrue() ? new Object() : new Decoy());
-
-/** Returns [:true:], but in a way that confuses the compiler. */
-opaqueTrue() => true;  // Expand as needed.
-
-checkNoSuchMethod(action()) {
-  var ex = null;
-  bool threw = false;
-  try {
-    action();
-  } catch (var e) {
-    threw = true;
-    ex = e;
-  }
-  if (!threw)
-    Expect.fail('Action should have thrown exception');
-
-  Expect.isTrue(ex is NoSuchMethodException, 'ex is NoSuchMethodException');
-}