using unittest via package import

tests/html/instance_of_test.dart

 library InstanceOfTest;
-import '../../pkg/unittest/lib/unittest.dart';
-import '../../pkg/unittest/lib/html_config.dart';
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
 import 'dart:html';
 
 main() {
   CanvasElement canvas;
 
   canvas = new Element.tag('canvas');
   canvas.attributes['width'] = '100';
   canvas.attributes['height'] = '100';
   document.body.append(canvas);
 
@@ skipping 47 matching lines @@
     expect(bytes, isNot(isCanvasElement));
     expect(bytes, isNot(isImageData));
     expect(bytes, isIntList);
 
     // FIXME: Ensure this is an SpanElement when we next update
     // WebKit IDL.
     var span = new Element.tag('span');
     expect(span, isElement);
   });
 }