Convert unittest to use "package:" imports.

pkg/unittest/lib/html_individual_config.dart

Index: pkg/unittest/lib/html_individual_config.dart
diff --git a/pkg/unittest/lib/html_individual_config.dart b/pkg/unittest/lib/html_individual_config.dart
index 662f5775d2c5156c80ce82d4f66fcc46e91c5227..fca58bfc1c8f72b8ac461db6c6334060c376d4c8 100644
--- a/pkg/unittest/lib/html_individual_config.dart
+++ b/pkg/unittest/lib/html_individual_config.dart
@@ -12,15 +12,15 @@
  * start of your set sequence. Important constraint: your group descriptions
  * MUST NOT contain spaces.
  */
-#library('unittest');
+library unittest;
 
-#import('unittest.dart', prefix: 'unittest');
-#import('html_config.dart', prefix: 'htmlconfig');
-#import('dart:html');
+import 'dart:html';
+import 'unittest.dart' as unittest;
+import 'html_config.dart' as htmlconfig;
 
 class HtmlIndividualConfiguration extends htmlconfig.HtmlConfiguration {
 
-  String _noSuchTest = ''; 
+  String _noSuchTest = '';
   HtmlIndividualConfiguration(isLayoutTest): super(isLayoutTest);
 
   void onStart() {