Trailing commas for named args in Flutter cons invocations (flutter-intellij#551).

pkg/analysis_server/test/services/correction/flutter_util.dart

Index: pkg/analysis_server/test/services/correction/flutter_util.dart
diff --git a/pkg/analysis_server/test/services/correction/flutter_util.dart b/pkg/analysis_server/test/services/correction/flutter_util.dart
index 5979e69b44c55a3d49ca8f0ff4d490b691fee99e..a15dd909639fd6793fcfb55be7c3d5f1e41f9777 100644
--- a/pkg/analysis_server/test/services/correction/flutter_util.dart
+++ b/pkg/analysis_server/test/services/correction/flutter_util.dart
@@ -17,7 +17,7 @@ class AspectRatio extends SingleChildRenderObjectWidget {}
 class Container extends StatelessWidget { Container({child: null, width: null, height: null}){}}
 class Center extends StatelessWidget { Center({child: null, key: null}){}}
 class DefaultTextStyle extends StatelessWidget { DefaultTextStyle({child: null}){}}
-class Row extends Widget { Row({List<Widget> children: null}){}}
+class Row extends Widget { Row({List<Widget> children: null, key: null}){}}
 class GestureDetector extends SingleChildRenderObjectWidget { GestureDetector({child: null, onTap: null}){}}
 class Scaffold extends Widget { Scaffold({body: null}){}}
 ''';