Completion boilerplate for Flutter cons children (flutter-intellij#463)

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 ca6536279c0e94afeb1c54fc5b6e4234ce7a8bf0..5979e69b44c55a3d49ca8f0ff4d490b691fee99e 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({children: null}){}}
+class Row extends Widget { Row({List<Widget> children: null}){}}
 class GestureDetector extends SingleChildRenderObjectWidget { GestureDetector({child: null, onTap: null}){}}
 class Scaffold extends Widget { Scaffold({body: null}){}}
 ''';