Fix some test suppressions for Chrome 60

tests/lib_strong/html/indexeddb_1_test.dart

Index: tests/lib_strong/html/indexeddb_1_test.dart
diff --git a/tests/lib_strong/html/indexeddb_1_test.dart b/tests/lib_strong/html/indexeddb_1_test.dart
index 093784e5a99f2b9dfe2e9266c52a4fce670fbecb..d2f79273569b5e296471eddcfd911e4a4e8a7f71 100644
--- a/tests/lib_strong/html/indexeddb_1_test.dart
+++ b/tests/lib_strong/html/indexeddb_1_test.dart
@@ -165,12 +165,6 @@ main() {
     });
   });
 
-  group('supportsDatabaseNames', () {
-    test('supported', () {
-      expect(html.window.indexedDB.supportsDatabaseNames, isTrue);
-    });
-  });
-
   group('functional', () {
     test('throws when unsupported', () {
       var expectation = idb.IdbFactory.supported ? returnsNormally : throws;