Remove support for mixin typedefs in dart2js.

pkg/compiler/lib/src/parser/node_listener.dart

Index: pkg/compiler/lib/src/parser/node_listener.dart
diff --git a/pkg/compiler/lib/src/parser/node_listener.dart b/pkg/compiler/lib/src/parser/node_listener.dart
index 26cbab3bc3960381805381aedd1f5de7ceea059c..4dc325cef5becfcb281cae7f5dc8aaa55653dc84 100644
--- a/pkg/compiler/lib/src/parser/node_listener.dart
+++ b/pkg/compiler/lib/src/parser/node_listener.dart
@@ -128,9 +128,9 @@ class NodeListener extends ElementListener {
       Token classKeyword, Token implementsKeyword, Token endToken) {
     NodeList interfaces = (implementsKeyword != null) ? popNode() : null;
     Node mixinApplication = popNode();
-    Modifiers modifiers = popNode();
     NodeList typeParameters = popNode();
     Identifier name = popNode();
+    Modifiers modifiers = popNode();
     pushNode(new NamedMixinApplication(name, typeParameters, modifiers,
         mixinApplication, interfaces, classKeyword, endToken));
   }