Report compile-time errors on cyclic hierarchies.

pkg/front_end/lib/src/fasta/kernel/kernel_class_builder.dart

Index: pkg/front_end/lib/src/fasta/kernel/kernel_class_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_class_builder.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_class_builder.dart
index c3258c0d24bb88148e405e0c22bb3f29be0a468d..34a72fea7d01a7c61b90ce1b3aa8a50e8a1f30dc 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_class_builder.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_class_builder.dart
@@ -268,16 +268,4 @@ abstract class KernelClassBuilder
       }
     }
   }
-
-  void addCompileTimeError(int charOffset, String message) {
-    library.addCompileTimeError(charOffset, message, fileUri: fileUri);
-  }
-
-  void addWarning(int charOffset, String message) {
-    library.addWarning(charOffset, message, fileUri: fileUri);
-  }
-
-  void addNit(int charOffset, String message) {
-    library.addNit(charOffset, message, fileUri: fileUri);
-  }
 }