Exclude function name from function type annotations in front end type inference tests.

pkg/analyzer/test/src/task/strong/front_end_inference_test.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
@@ skipping 179 matching lines @@
   void _appendParameters(
       StringBuffer buffer, List<ParameterElement> parameters) {
     _appendList<ParameterElement>(buffer, '(', ')', parameters, ', ',
         (parameter) {
       _appendType(buffer, parameter.type);
     }, includeEmpty: true);
   }
 
   void _appendType(StringBuffer buffer, DartType type) {
     if (type is FunctionType) {
-      Element element = type.element;
-      _appendElementName(buffer, element);
       _appendTypeArguments(buffer, type.typeArguments);
       _appendParameters(buffer, type.parameters);
       buffer.write(' -> ');
       _appendType(buffer, type.returnType);
     } else if (type is InterfaceType) {
       ClassElement element = type.element;
       _appendElementName(buffer, element);
       _appendTypeArguments(buffer, type.typeArguments);
     } else {
       buffer.write(type.toString());
@@ skipping 183 matching lines @@
 
   /// Based on DDC code generator's `_recoverTypeArguments`
   Iterable<DartType> _recoverTypeArguments(FunctionType g, FunctionType f) {
     assert(identical(g.element, f.element));
     assert(g.typeFormals.isNotEmpty && f.typeFormals.isEmpty);
     assert(g.typeFormals.length + g.typeArguments.length ==
         f.typeArguments.length);
     return f.typeArguments.skip(g.typeArguments.length);
   }
 }