Remove uses of unittest in the HTML tests where possible.

pkg/dev_compiler/test/codegen/lib/html/typed_arrays_4_test.dart

Index: pkg/dev_compiler/test/codegen/lib/html/typed_arrays_4_test.dart
diff --git a/pkg/dev_compiler/test/codegen/lib/html/typed_arrays_4_test.dart b/pkg/dev_compiler/test/codegen/lib/html/typed_arrays_4_test.dart
index 9f00357ec91591a426e19778fb64e85a0eeff52b..c75ade8080d24a701a7cf14dd71b85adec1d47d7 100644
--- a/pkg/dev_compiler/test/codegen/lib/html/typed_arrays_4_test.dart
+++ b/pkg/dev_compiler/test/codegen/lib/html/typed_arrays_4_test.dart
@@ -2,15 +2,12 @@
 // 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.
 
-library TypedArrays4Test;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
 import 'dart:html';
 import 'dart:typed_data';
 
-main() {
-  useHtmlConfiguration();
+import 'package:expect/minitest.dart';
 
+main() {
   // Only perform tests if ArrayBuffer is supported.
   if (!Platform.supportsTypedData) {
     return;