Make server use the common protocol classes

pkg/analysis_server/test/integration/analysis/outline_test.dart

 // Copyright (c) 2014, 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:analysis_server/protocol/protocol_generated.dart';
+import 'package:analyzer_plugin/protocol/protocol_common.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../support/integration_tests.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(OutlineTest);
   });
 }
@@ skipping 58 matching lines @@
       expect(members, hasLength(5));
       expect(members[0].element.name, equals('field'));
       expect(members[1].element.name, equals('method'));
       expect(members[2].element.name, equals('staticMethod'));
       expect(members[3].element.name, equals('getter'));
       expect(members[4].element.name, equals('setter'));
       checkConnected(members);
     });
   }
 }