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

tests/language_2/function_type/function_type1_test.dart

Index: tests/language_2/function_type/function_type1_test.dart
diff --git a/tests/language_2/function_type/function_type1_test.dart b/tests/language_2/function_type/function_type1_test.dart
index ce7c93fbbcdab42ab5de9a8d322d57071aec78da..4eb5df8245cab2be828726d4fc053166dd02488c 100644
--- a/tests/language_2/function_type/function_type1_test.dart
+++ b/tests/language_2/function_type/function_type1_test.dart
@@ -222,10 +222,10 @@ class U1<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>);
     }
   }