Enable tests.

tests/html/fileapi_test.dart

 library fileapi;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:html';
 
 void fail(message) {
   guardAsync(() {
     expect(false, isTrue, reason: message);
   });
 }
@@ skipping 75 matching lines @@
       });
 
       test('fileCreate', () {
         fs.root.getFile(
             'file4',
             options: {'create': true},
             successCallback: expectAsync1((FileEntry e) {
               expect(e.name, equals('file4'));
               expect(e.isFile, isTrue);
 
-              // Bug 8836 Re-enable once Dartium supports DateTime properties.
-              //e.getMetadata(expectAsync1((Metadata metadata) {
-              //  var changeTime = metadata.modificationTime;
-              //  expect(new DateTime.now().difference(changeTime).inSeconds,
-              //    lessThan(60));
-              //}));
+              e.getMetadata(expectAsync1((Metadata metadata) {
+                var changeTime = metadata.modificationTime;
+                expect(new DateTime.now().difference(changeTime).inSeconds,
+                  lessThan(60));
+              }));
             }),
             errorCallback: (e) {
               fail('Got file error: ${e.code}');
             });
         });
     }
   });
 }