Adjust IDB test to work for JS as well.

tests/html/indexeddb_1_test.dart

 library IndexedDB1Test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:async';
 import 'dart:html' as html;
 import 'dart:math' as math;
 import 'dart:indexed_db' as idb;
 
 const String STORE_NAME = 'TEST';
 const int VERSION = 1;
@@ skipping 111 matching lines @@
 void testTypes(testFunction) {
   test('String', testFunction(123, 'Hoot!', equals('Hoot!')));
   test('int', testFunction(123, 12345, equals(12345)));
   test('List', testFunction(123, [1, 2, 3], equals([1, 2, 3])));
   test('List 2', testFunction(123, [2, 3, 4], equals([2, 3, 4])));
   test('bool', testFunction(123, [true, false], equals([true, false])));
   test('largeInt', testFunction(123, 1371854424211,
       equals("1371854424211"), null, STORE_NAME, VERSION, true));
   test('largeDoubleConvertedToInt', testFunction(123, 1371854424211.0,
       equals("1371854424211"), null, STORE_NAME, VERSION, true));
-  // TODO(efortuna): Investigate.
-  //test('double', testFunction(123, math.pow(2, 53),
-  //    equals("9007199254740992.0"), null, STORE_NAME, VERSION, true));
   test('largeIntInMap', testFunction(123, {'time': 4503599627370492},
       equals("{time: 4503599627370492}"), null, STORE_NAME, VERSION, true));
   var now = new DateTime.now();
   test('DateTime', testFunction(123, now,
     predicate((date) =>
       date.millisecondsSinceEpoch == now.millisecondsSinceEpoch)));
 }
 
 main() {
   useHtmlIndividualConfiguration();
@@ skipping 28 matching lines @@
       test('upgrade', testUpgrade);
       group('dynamic', () {
         testTypes(testReadWrite);
       });
       group('typed', () {
         testTypes(testReadWriteTyped);
       });
     }
   });
 }