Remove unintentional dependency on analysis_server

pkg/analyzer_plugin/test/src/utilities/change_builder/change_builder_dart_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 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
 import 'package:analyzer/src/context/source.dart';
 import 'package:analyzer/src/dart/analysis/driver.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/resolver.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:analyzer/src/generated/testing/test_type_provider.dart';
+import 'package:analyzer_plugin/protocol/protocol_generated.dart';
 import 'package:analyzer_plugin/src/utilities/change_builder/change_builder_dart.dart';
 import 'package:analyzer_plugin/utilities/change_builder/change_builder_core.dart';
 import 'package:analyzer_plugin/utilities/change_builder/change_builder_dart.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../../support/abstract_context.dart';
 
 main() {
   defineReflectiveSuite(() {
@@ skipping 1164 matching lines @@
     CompilationUnit unit = (await driver.getResult(path))?.unit;
     ClassDeclaration classC = unit.declarations[2];
     DartLinkedEditBuilderImpl builder = new DartLinkedEditBuilderImpl(null);
     builder.addSuperTypesAsSuggestions(classC.element.type);
     List<LinkedEditSuggestion> suggestions = builder.suggestions;
     expect(suggestions, hasLength(4));
     expect(suggestions.map((s) => s.value),
         unorderedEquals(['Object', 'A', 'B', 'C']));
   }
 }