Make server use the common protocol classes

pkg/analysis_server/test/services/refactoring/rename_label_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 'abstract_rename.dart';
 
 main() {
   defineReflectiveSuite(() {
     defineReflectiveTests(RenameLabelTest);
   });
 }
@@ skipping 58 matching lines @@
     break test;
   }
 }
 ''');
     // configure refactoring
     createRenameRefactoringAtString('test:');
     // old name
     expect(refactoring.oldName, 'test');
   }
 }