Remove uses of unittest in the HTML tests where possible.

pkg/dev_compiler/test/codegen/lib/html/typed_arrays_3_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 TypedArrays3Test;
-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('setElementsTest_dynamic', () {
       var a1 = new Int8List(1024);
 
       a1.setRange(4, 7, [0x50,0x60,0x70]);
 
@@ skipping 13 matching lines @@
 
       Uint32List a2 = new Uint32List.view(a1.buffer);
       expect(a2[0], 0x00000000);
       expect(a2[1], 0x00706050);
 
       a2.setRange(2, 3, [0x01020304]);
       expect(a1[8], 0x04);
       expect(a1[11], 0x01);
   });
 }