Revert "fix #30462, update function_type tests to understand covariant generics"

tests/language_2/function_type/function_type9_test.dart

Index: tests/language_2/function_type/function_type9_test.dart
diff --git a/tests/language_2/function_type/function_type9_test.dart b/tests/language_2/function_type/function_type9_test.dart
index ae7be562b94d0a0e5c87d6c92e2e1ff4d99681a0..6ef7031cb5c2b9925a6184dd63a8d84cea7705f5 100644
--- a/tests/language_2/function_type/function_type9_test.dart
+++ b/tests/language_2/function_type/function_type9_test.dart
@@ -226,10 +226,10 @@ class U9<T> {
       });
     }
     if (tIsInt || tIsBool) {
-      Expect.equals(true, m1 is F1<int>);
-      Expect.equals(true, m1 is F1<bool>);
-      Expect.equals(true, confuse(m1) is F1<int>);
-      Expect.equals(true, confuse(m1) is F1<bool>);
+      Expect.equals(tIsInt, m1 is F1<int>);
+      Expect.equals(tIsBool, m1 is F1<bool>);
+      Expect.equals(tIsInt, confuse(m1) is F1<int>);
+      Expect.equals(tIsBool, confuse(m1) is F1<bool>);
     }
   }