Run dartfmt on kernel package

pkg/kernel/testcases/input/uninitialized_fields.dart

Index: pkg/kernel/testcases/input/uninitialized_fields.dart
diff --git a/pkg/kernel/testcases/input/uninitialized_fields.dart b/pkg/kernel/testcases/input/uninitialized_fields.dart
index 5ff04ff8d52d7520701d147e12aaa71ae74b9e5c..b8d240c78dbdf9d47b003c41de969a2f2550bebe 100644
--- a/pkg/kernel/testcases/input/uninitialized_fields.dart
+++ b/pkg/kernel/testcases/input/uninitialized_fields.dart
@@ -4,15 +4,18 @@
 class Uninitialized {
   int x;
 }
+
 class PartiallyInitialized {
   int x;
   PartiallyInitialized(this.x);
   PartiallyInitialized.noInitializer();
 }
+
 class Initialized {
   int x;
   Initialized(this.x);
 }
+
 class Forwarding {
   int x;
   Forwarding.initialize(this.x);
@@ -22,6 +25,4 @@ class Forwarding {
 int uninitializedTopLevel;
 int initializedTopLevel = 4;
 
-main() {
-
-}
+main() {}