Remove pkg/front_end's remaining dependencies on pkg/analyzer.

pkg/front_end/test/src/base/test_all.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 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import 'api_signature_test.dart' as api_signature;
 import 'file_repository_test.dart' as file_repository;
 import 'flat_buffers_test.dart' as flat_buffers;
-import 'libraries_reader_test.dart' as libraries_reader;
 import 'processed_options_test.dart' as processed_options;
 import 'uri_resolver_test.dart' as uri_resolver;
 
 /// Utility for manually running all tests.
 main() {
   defineReflectiveSuite(() {
     api_signature.main();
     file_repository.main();
     flat_buffers.main();
-    libraries_reader.main();
     processed_options.main();
     uri_resolver.main();
   }, name: 'incremental');
 }