Start cleaning up the HTML tests.

pkg/dev_compiler/test/codegen/lib/html/js_typed_interop_anonymous2_exp_test.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // SharedOptions=--experimental-trust-js-interop-type-annotations
 
 // Same test as js_typed_interop_anonymous2, but using the
 // --experimental-trust-js-interop-type-annotations flag.
 @JS()
 library js_typed_interop_anonymous2_exp_test;
 
 import 'dart:html';
 import 'dart:js' as js;
 
 import 'package:js/js.dart';
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
+import 'package:minitest/minitest.dart';
 
 @JS() @anonymous
 class A {
   external factory A({B b});
 
   external B get b;
 }
 
 @JS() @anonymous
 class B {
   external factory B({C c});
 
   external C get c;
 }
 
 @JS() @anonymous
 class C {
   external factory C();
 }
 
 // D is unreachable, and that is OK
 @JS() @anonymous
 class D {
   external factory D();
 }
 
 main() {
-  useHtmlConfiguration();
-
   test('simple', () {
     var b = new B();
     var a = new A(b: b);
     expect(a.b, equals(b));
     expect(b.c, isNull);
   });
 }