Pass '=' to endNamedMixinApplication().

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

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library fasta.outline_builder;
 
 import 'package:kernel/ast.dart' show
     AsyncMarker,
     ProcedureKind;
 
@@ skipping 301 matching lines @@
     push(library.addMixinApplication(supertype, mixins, -1));
   }
 
   @override
   void beginNamedMixinApplication(Token begin, Token name) {
     library.beginNestedDeclaration(name.value, hasMembers: false);
   }
 
   @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();
     List<TypeVariableBuilder> typeVariables = pop();
     String name = pop();
     if (typeVariables != null && mixinApplication is MixinApplicationBuilder) {
       mixinApplication.typeVariables = typeVariables;
       mixinApplication.subclassName = name;
     }
     int modifiers = Modifier.validate(pop());
@@ skipping 281 matching lines @@
   Link<Token> handleMemberName(Link<Token> identifiers) {
     if (!isDartLibrary || identifiers.isEmpty) return identifiers;
     return removeNativeClause(identifiers);
   }
 
   @override
   void debugEvent(String name) {
     // printEvent(name);
   }
 }