Fix hints and clean-up obsolete comment syntax (TBR)

pkg/analysis_server/test/context_manager_test.dart

Index: pkg/analysis_server/test/context_manager_test.dart
diff --git a/pkg/analysis_server/test/context_manager_test.dart b/pkg/analysis_server/test/context_manager_test.dart
index 870bb777175f9764afbfe8e01c4ebc2191209ed1..26aaa31b78862d7cbb25c932791fc461f76293ec 100644
--- a/pkg/analysis_server/test/context_manager_test.dart
+++ b/pkg/analysis_server/test/context_manager_test.dart
@@ -2747,11 +2747,6 @@ class TestContextManagerCallbacks extends ContextManagerCallbacks {
     currentContextSources.remove(path);
     lastFlushedFiles = flushedFiles;
   }
-
-  @override
-  void updateContextPackageUriResolver(AnalysisContext context) {
-    // Nothing to do.
-  }
 }
 
 /**