fix #25794, infer parameter type from default value, in AST summaries

pkg/analyzer/test/src/summary/resynthesize_ast_test.dart

Index: pkg/analyzer/test/src/summary/resynthesize_ast_test.dart
diff --git a/pkg/analyzer/test/src/summary/resynthesize_ast_test.dart b/pkg/analyzer/test/src/summary/resynthesize_ast_test.dart
index 3cf454f8f4e195f6644835f3ffdab3690c7aceab..1adaae0e0c5437fd6b4eeeaa9009bfa5d0cfceb0 100644
--- a/pkg/analyzer/test/src/summary/resynthesize_ast_test.dart
+++ b/pkg/analyzer/test/src/summary/resynthesize_ast_test.dart
@@ -510,12 +510,6 @@ var b = a.m();
 
   @override
   @failingTest
-  void test_inferDefaultFormalParameter() {
-    super.test_inferDefaultFormalParameter();
-  }
-
-  @override
-  @failingTest
   void test_inferenceInCyclesIsDeterministic() {
     super.test_inferenceInCyclesIsDeterministic();
   }