Enable tests.

tests/html/fileapi_test.dart

Index: tests/html/fileapi_test.dart
diff --git a/tests/html/fileapi_test.dart b/tests/html/fileapi_test.dart
index 7d1aa1d96b8e6db003ed56d18cb2f12a80150568..079197fc88204d4df20240bd87015c49d1017098 100644
--- a/tests/html/fileapi_test.dart
+++ b/tests/html/fileapi_test.dart
@@ -93,12 +93,11 @@ main() {
               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}');