Disable infer-from-overrides by default

test/checker/checker_test.dart

Index: test/checker/checker_test.dart
diff --git a/test/checker/checker_test.dart b/test/checker/checker_test.dart
index 5652749ee3077d9505d308ee141e85febd29d158..30995002972b9f56a08a69cbd33a9a3fc7ff7bb9 100644
--- a/test/checker/checker_test.dart
+++ b/test/checker/checker_test.dart
@@ -1683,7 +1683,7 @@ main() {
             /*severe:InvalidMethodOverride*/dynamic get f4 => null;
           }
        '''
-    });
+    }, inferFromOverrides: true);
   });
 
   test('setter/setter override', () {
@@ -1769,7 +1769,7 @@ main() {
             /*severe:InvalidMethodOverride*/dynamic m6(dynamic value) {}
           }
        '''
-    });
+    }, inferFromOverrides: true);
   });
 
   test('binary operators', () {