Test fix for new dart2js hints default.

pkg/analyzer/test/src/task/dart_test.dart

Index: pkg/analyzer/test/src/task/dart_test.dart
diff --git a/pkg/analyzer/test/src/task/dart_test.dart b/pkg/analyzer/test/src/task/dart_test.dart
index f8872104e1cd64ca25eb639a7cb559164b187de4..16f1696884f4209a1a7f6c78099be0c8577315cd 100644
--- a/pkg/analyzer/test/src/task/dart_test.dart
+++ b/pkg/analyzer/test/src/task/dart_test.dart
@@ -1839,6 +1839,9 @@ int main() {
   }
 
   test_perform_dart2js() {
+    AnalysisOptionsImpl options = new AnalysisOptionsImpl();
+    options.dart2jsHint = true;
+    prepareAnalysisContext(options);
     Source source = newSource(
         '/test.dart',
         '''