Start cleaning up the HTML tests.

pkg/dev_compiler/test/codegen/lib/html/indexeddb_2_test.dart

 library IndexedDB1Test;
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 import 'dart:async';
 import 'dart:html' as html;
 import 'dart:indexed_db' as idb;
 import 'dart:collection';
 import 'utils.dart';
 
 // Write and re-read Maps: simple Maps; Maps with DAGs; Maps with cycles.
@@ skipping 51 matching lines @@
   var obj2 = {'x': obj1, 'y': obj1};  // DAG.
 
   var obj3 = {};
   obj3['a'] = 100;
   obj3['b'] = obj3;  // Cycle.
 
   var obj4 = new SplayTreeMap<String, dynamic>();  // Different implementation.
   obj4['a'] = 100;
   obj4['b'] = 's';
 
-  var cyclic_list = [1, 2, 3];
+  var cyclic_list = <Object>[1, 2, 3];
   cyclic_list[1] = cyclic_list;
 
   go(name, data) => test(name,
     () => testReadWrite(123, data, verifyGraph));
 
   test('test_verifyGraph', () {
       // Nice to know verifyGraph is working before we rely on it.
       verifyGraph(obj4, obj4);
       verifyGraph(obj1, new Map.from(obj1));
       verifyGraph(obj4, new Map.from(obj4));
@@ skipping 14 matching lines @@
     go('test_cycle', obj3);
     go('test_simple_splay', obj4);
     go('const_array_1', const [const [1], const [2]]);
     go('const_array_dag', const [const [1], const [1]]);
     go('array_deferred_copy', [1,2,3, obj3, obj3, 6]);
     go('array_deferred_copy_2', [1,2,3, [4, 5, obj3], [obj3, 6]]);
     go('cyclic_list', cyclic_list);
     go('non-native lists', nonNativeListData);
   }
 }