Start cleaning up the HTML tests.

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

-library DocumentTest;
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_individual_config.dart';
 import 'dart:html';
 
+import 'package:minitest/minitest.dart';
+
 main() {
-  useHtmlIndividualConfiguration();
-
   var isElement = predicate((x) => x is Element, 'is an Element');
   var isDivElement = predicate((x) => x is DivElement, 'is a DivElement');
   var isAnchorElement =
       predicate((x) => x is AnchorElement, 'is an AnchorElement');
   var isUnknownElement =
       predicate((x) => x is UnknownElement, 'is UnknownElement');
 
   var inscrutable;
 
   test('CreateElement', () {
@@ skipping 33 matching lines @@
       expect(doc.adoptNode(div), div);
       expect(div.ownerDocument, doc);
       doc.body.nodes.add(div);
       expect(doc.query('#foo').text, 'bar');
     });
 
     test('importNode', () {
       var div = new Element.html('<div><div id="foo">bar</div></div>');
       var doc = document.implementation.createHtmlDocument('');
       var div2 = doc.importNode(div, true);
-      expect(div2, isNot(equals(div)));
+      expect(div2, notEquals(div));
       expect(div2.ownerDocument, doc);
       doc.body.nodes.add(div2);
       expect(doc.query('#foo').text, 'bar');
     });
 
     test('typeTest1', () {
       inscrutable = inscrutable(inscrutable);
       var doc1 = document;
       expect(doc1 is HtmlDocument, true);
       expect(inscrutable(doc1) is HtmlDocument, true);
       var doc2 = document.implementation.createHtmlDocument('');
       expect(doc2 is HtmlDocument, true);
       expect(inscrutable(doc2) is HtmlDocument, true);
     });
 
     test('typeTest2', () {
       inscrutable = inscrutable(inscrutable);
       // XML document.
       var doc3 = document.implementation.createDocument(null, 'report', null);
       expect(doc3 is HtmlDocument, false);
       expect(inscrutable(doc3) is HtmlDocument, false);
     });
   });
 }