Pass '=' to endNamedMixinApplication().

pkg/front_end/lib/src/fasta/source/outline_builder.dart

Index: pkg/front_end/lib/src/fasta/source/outline_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/source/outline_builder.dart b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
index f48afa3a387ef39590fb093c788d1d00ea8952a5..90f48f5eb8695d11bd23a19505524f462a9b7c44 100644
--- a/pkg/front_end/lib/src/fasta/source/outline_builder.dart
+++ b/pkg/front_end/lib/src/fasta/source/outline_builder.dart
@@ -319,7 +319,8 @@ class OutlineBuilder extends UnhandledListener {
 
   @override
   void endNamedMixinApplication(
-      Token classKeyword, Token implementsKeyword, Token endToken) {
+      Token classKeyword, Token equals, Token implementsKeyword,
+      Token endToken) {
     debugEvent("endNamedMixinApplication");
     List<TypeBuilder> interfaces = popIfNotNull(implementsKeyword);
     TypeBuilder mixinApplication = pop();