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

tests/language_2/function_type/function_type52_test.dart

Index: tests/language_2/function_type/function_type52_test.dart
diff --git a/tests/language_2/function_type/function_type52_test.dart b/tests/language_2/function_type/function_type52_test.dart
index d03a4db2d78abeac4c074268a7d6b281a9def1a8..24e49c87e0d096d4e56a3e85be79352ad67b5aa6 100644
--- a/tests/language_2/function_type/function_type52_test.dart
+++ b/tests/language_2/function_type/function_type52_test.dart
@@ -193,10 +193,10 @@ class U52<T> {
       });
     }
     if (tIsInt || tIsBool) {
-      Expect.equals(true, m0 is F0<int>);
-      Expect.equals(true, m0 is F0<bool>);
-      Expect.equals(true, confuse(m0) is F0<int>);
-      Expect.equals(true, confuse(m0) is F0<bool>);
+      Expect.equals(tIsInt, m0 is F0<int>);
+      Expect.equals(tIsBool, m0 is F0<bool>);
+      Expect.equals(tIsInt, confuse(m0) is F0<int>);
+      Expect.equals(tIsBool, confuse(m0) is F0<bool>);
     }
   }
 
@@ -340,10 +340,10 @@ class U52<T> {
       });
     }
     if (tIsInt || tIsBool) {
-      Expect.equals(true, m4 is F4<int>);
-      Expect.equals(true, m4 is F4<bool>);
-      Expect.equals(true, confuse(m4) is F4<int>);
-      Expect.equals(true, confuse(m4) is F4<bool>);
+      Expect.equals(tIsInt, m4 is F4<int>);
+      Expect.equals(tIsBool, m4 is F4<bool>);
+      Expect.equals(tIsInt, confuse(m4) is F4<int>);
+      Expect.equals(tIsBool, confuse(m4) is F4<bool>);
     }
   }