Run dartfmt on all files under runtime.

runtime/observatory/tests/service/implicit_getter_setter_test.dart

Index: runtime/observatory/tests/service/implicit_getter_setter_test.dart
diff --git a/runtime/observatory/tests/service/implicit_getter_setter_test.dart b/runtime/observatory/tests/service/implicit_getter_setter_test.dart
index dbf448785b5937398217cec08b14f6f49ae11809..700ef287e1727f684b662ff528567c8e4ef4ff13 100644
--- a/runtime/observatory/tests/service/implicit_getter_setter_test.dart
+++ b/runtime/observatory/tests/service/implicit_getter_setter_test.dart
@@ -40,7 +40,6 @@ testGetter(Isolate isolate) async {
   expect(classDouble.name, equals('_Double'));
 }
 
-
 testSetter(Isolate isolate) async {
   Library rootLibrary = await isolate.rootLibrary.load();
   expect(rootLibrary.classes.length, equals(1));
@@ -63,7 +62,6 @@ testSetter(Isolate isolate) async {
   expect(classDouble.name, equals('_Double'));
 }
 
-
 var tests = [testGetter, testSetter];
 
 main(args) => runIsolateTests(args, tests, testeeBefore: script);