Move unittest from lib to pkg.

tests/html/dart_object_local_storage_test.dart

 #library('DartObjectLocalStorageTest');
-#import('../../lib/unittest/unittest.dart');
-#import('../../lib/unittest/html_config.dart');
+#import('../../pkg/unittest/unittest.dart');
+#import('../../pkg/unittest/html_config.dart');
 #import('dart:html');
 
 // TODO(vsm): Rename this to wrapper_caching_test or similar.  It's
 // basically a port of dom/dart_object_local_storage_test.dart.  For
 // wrapping implementation of dart:html (i.e., the dartium one), it is
 // effectively testing dart_object_local_storage in the underlying dom
 // object.
 main() {
   useHtmlConfiguration();
 
@@ skipping 11 matching lines @@
       Expect.equals(localStorage, window.localStorage);
   });
   test('sessionStorage', () {
       Expect.equals(sessionStorage, window.sessionStorage);
   });
   test('unknown', () {
       var test = document.query('#test');
       Expect.equals(element, test);
   });
 }