Revert "Add typedef AST node boilerplate."

pkg/kernel/test/type_parser.dart

Index: pkg/kernel/test/type_parser.dart
diff --git a/pkg/kernel/test/type_parser.dart b/pkg/kernel/test/type_parser.dart
index 5bbb2d3220096cb1c29f373ded7a6f7baf508429..38209b4365e25bf3490f3d402d425246c48ac7f9 100644
--- a/pkg/kernel/test/type_parser.dart
+++ b/pkg/kernel/test/type_parser.dart
@@ -141,8 +141,6 @@ class DartTypeParser {
           return fail('Unresolved type $name');
         } else if (target is Class) {
           return new InterfaceType(target, parseOptionalTypeArgumentList());
-        } else if (target is Typedef) {
-          return new TypedefType(target, parseOptionalTypeArgumentList());
         } else if (target is TypeParameter) {
           if (peekToken() == Token.LeftAngle) {
             return fail('Attempt to apply type arguments to a type variable');