cpsir: triage remainder of html test suite, fix a couple.

tests/html/input_element_test.dart

 library input_element_test;
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_individual_config.dart';
 import 'dart:html';
 
 void check(InputElement element, String type, [bool supported = true]) {
   expect(element is InputElement, true);
   if (supported) {
     expect(element.type, type);
   } else {
@@ skipping 168 matching lines @@
   });
 
   group('attributes', () {
     test('valueSetNull', () {
       final e = new TextInputElement();
       e.value = null;
       expect(e.value, '');
     });
     test('valueSetNullProxy', () {
       final e = new TextInputElement();
-      var list = new List(5);
-      e.value = list[0];

[Siggi Cherem (dart-lang), 2016/02/06 02:36:27]

we replaced this with null, but SSA didn't, the new code consistently makes this
undefined.

+      e.value = _undefined;
       expect(e.value, '');
     });
   });
 }
+
+var _undefined = (() => new List(5)[0])();