Start cleaning up the HTML tests.

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

-library CacheTest;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_individual_config.dart';
 import 'dart:html';
 
+import 'package:minitest/minitest.dart';
+
 main() {
-  useHtmlIndividualConfiguration();
-
   group('supported', () {
     test('supported', () {
-      expect(ApplicationCache.supported, true);
+      expect(ApplicationCache.supported, isTrue);
     });
   });
 
   group('ApplicationCache', () {
     test('ApplicationCache', () {
       var expectation = ApplicationCache.supported ? returnsNormally : throws;
       expect(() {
         ApplicationCache appCache = window.applicationCache;
         expect(cacheStatusToString(appCache.status), "UNCACHED");
       }, expectation);
-
     });
   });
-
 }
 
 String cacheStatusToString(int status) {
   switch (status) {
     case ApplicationCache.UNCACHED: // UNCACHED == 0
       return 'UNCACHED';
     case ApplicationCache.IDLE: // IDLE == 1
       return 'IDLE';
     case ApplicationCache.CHECKING: // CHECKING == 2
       return 'CHECKING';
     case ApplicationCache.DOWNLOADING: // DOWNLOADING == 3
       return 'DOWNLOADING';
     case ApplicationCache.UPDATEREADY:  // UPDATEREADY == 4
       return 'UPDATEREADY';
     case ApplicationCache.OBSOLETE: // OBSOLETE == 5
       return 'OBSOLETE';
     default:
       return 'UNKNOWN CACHE STATUS';
   };
 }