Eliminate Modifier.TYPEDEF and deprecate ClassElement.isTypedef.

pkg/analysis_server/lib/src/status/element_writer.dart

Index: pkg/analysis_server/lib/src/status/element_writer.dart
diff --git a/pkg/analysis_server/lib/src/status/element_writer.dart b/pkg/analysis_server/lib/src/status/element_writer.dart
index 6ca70a58a3dea68a40ba87c357d2ba728391aa54..fd73cef8b5460f0a798655f7ebce50ebba696d37 100644
--- a/pkg/analysis_server/lib/src/status/element_writer.dart
+++ b/pkg/analysis_server/lib/src/status/element_writer.dart
@@ -54,7 +54,7 @@ class ElementWriter extends GeneralizingElementVisitor with TreeWriter {
       properties['isEnum'] = element.isEnum;
       properties['isOrInheritsProxy'] = element.isOrInheritsProxy;
       properties['isProxy'] = element.isProxy;
-      properties['isTypedef'] = element.isTypedef;
+      properties['isTypedef'] = element.isMixinApplication;
       properties['isValidMixin'] = element.isValidMixin;
       properties['mixins'] = element.mixins;
       properties['supertype'] = element.supertype;