Remove uses of unittest in the HTML tests where possible.

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

 // Copyright (c) 2012, 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.
 
-library TypedArrays4Test;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
 import 'dart:html';
 import 'dart:typed_data';
 
+import 'package:expect/minitest.dart';
+
 main() {
-  useHtmlConfiguration();
-
   // Only perform tests if ArrayBuffer is supported.
   if (!Platform.supportsTypedData) {
     return;
   }
 
   test('indexOf_dynamic', () {
       var a1 = new Uint8List(1024);
       for (int i = 0; i < a1.length; i++) {
         a1[i] = i;
       }
@@ skipping 15 matching lines @@
 
       expect(a1.indexOf(50), 50);
       expect(a1.indexOf(50, 50), 50);
       expect(a1.indexOf(50, 51), 256 + 50);
 
       expect(a1.lastIndexOf(50), 768 + 50);
       expect(a1.lastIndexOf(50, 768 + 50), 768 + 50);
       expect(a1.lastIndexOf(50, 768 + 50 - 1), 512 + 50);
   });
 }