Format all tests.

tests/html/custom/document_register_basic_test.dart

Index: tests/html/custom/document_register_basic_test.dart
diff --git a/tests/html/custom/document_register_basic_test.dart b/tests/html/custom/document_register_basic_test.dart
index cf11b6373de8cdda251fcca254c34c98d7e3fb0d..b416ed5f0bf5da37e3d480f933e7c124b1654415 100644
--- a/tests/html/custom/document_register_basic_test.dart
+++ b/tests/html/custom/document_register_basic_test.dart
@@ -3,6 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 library document_register_basic_test;
+
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 import 'dart:html';
@@ -32,8 +33,7 @@ class Baz extends Foo {
   get thisIsAlsoACustomClass => true;
 }
 
-class BadB {
-}
+class BadB {}
 
 abstract class BadC extends HtmlElement {
   BadC.created() : super.created();