Run dartfmt on kernel package

pkg/kernel/testcases/input/micro.dart

 staticMethod() {
   return "sdfg";
 }
 
 class Foo {
   instanceMethod() {
     return 123;
   }
 }
 
 external bool externalStatic();
 
 abstract class ExternalValue {}
 
 abstract class Bar {
   ExternalValue externalInstanceMethod();
 }
 
 external Bar createBar();
 
 class Box {
   var field;
 }
 
-stringArgument(x) {
-}
+stringArgument(x) {}
 
-intArgument(x) {
-}
+intArgument(x) {}
 
 class FinalBox {
   final finalField;
   FinalBox(this.finalField);
 }
 
 class SubFinalBox extends FinalBox {
   SubFinalBox(value) : super(value);
 }
 
 class DynamicReceiver1 {
   dynamicallyCalled(x) {}
 }
+
 class DynamicReceiver2 {
   dynamicallyCalled(x) {}
 }
 
 void makeDynamicCall(receiver) {
   receiver.dynamicallyCalled("sdfg");
 }
 
 main() {
   var x = staticMethod();
@@ skipping 13 matching lines @@
 
   var subBox = new SubFinalBox("dfg");
   var c = subBox.finalField;
 
   makeDynamicCall(new DynamicReceiver1());
   makeDynamicCall(new DynamicReceiver2());
 
   var list = ["string"];
   var d = list[0];
 }