sort_constructors_first (#22575)

diff --git a/packages/flutter_tools/lib/src/devfs.dart b/packages/flutter_tools/lib/src/devfs.dart
index 3dd8819..54b7107 100644
--- a/packages/flutter_tools/lib/src/devfs.dart
+++ b/packages/flutter_tools/lib/src/devfs.dart
@@ -201,10 +201,10 @@
 /// An implementation of [DevFSOperations] that speaks to the
 /// vm service.
 class ServiceProtocolDevFSOperations implements DevFSOperations {
-  final VMService vmService;
-
   ServiceProtocolDevFSOperations(this.vmService);
 
+  final VMService vmService;
+
   @override
   Future<Uri> create(String fsName) async {
     final Map<String, dynamic> response = await vmService.vm.createDevFS(fsName);