Fix a typo in path_set_test.

pkg/watcher/test/path_set_test.dart

Index: pkg/watcher/test/path_set_test.dart
diff --git a/pkg/watcher/test/path_set_test.dart b/pkg/watcher/test/path_set_test.dart
index dc1f72977b9b1f121e8b4c9a5742eed090b4bf9a..f433ad3c35cfae2d60038b4139cbd848edbc3429 100644
--- a/pkg/watcher/test/path_set_test.dart
+++ b/pkg/watcher/test/path_set_test.dart
@@ -218,7 +218,7 @@ void main() {
       set.add("root/path/to/two");
       set.remove("root/path/to/two");
 
-      expect(set.toSet(), unorderedEquals([p.normalizze("root/path/to/one")]));
+      expect(set.toSet(), unorderedEquals([p.normalize("root/path/to/one")]));
     });
   });