Remove uses of unittest in the HTML tests where possible.

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

Index: pkg/dev_compiler/test/codegen/lib/html/xsltprocessor_test.dart
diff --git a/pkg/dev_compiler/test/codegen/lib/html/xsltprocessor_test.dart b/pkg/dev_compiler/test/codegen/lib/html/xsltprocessor_test.dart
index b645d816fed3950bf72ddb324711ddf82195f576..3dd93a849a3faab1fc7223f829bb5f687777d06b 100644
--- a/pkg/dev_compiler/test/codegen/lib/html/xsltprocessor_test.dart
+++ b/pkg/dev_compiler/test/codegen/lib/html/xsltprocessor_test.dart
@@ -1,12 +1,8 @@
-library XSLTProcessorTest;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_individual_config.dart';
 import 'dart:html';
 
-main() {
-
-  useHtmlIndividualConfiguration();
+import 'package:expect/minitest.dart';
 
+main() {
   group('supported', () {
     test('supported', () {
       expect(XsltProcessor.supported, true);