general completion contributor cleanup

pkg/analysis_server/test/stress/replay/operation.dart

 // Copyright (c) 2015, 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.
 
 /**
  * Operations to be performed during the simulation.
  */
 library analysis_server.test.stress.replay.replay;
 
-import 'package:analysis_server/plugin/protocol/protocol.dart';
-
 import '../utilities/server.dart';
 
 /**
  * An operation that will send an 'analysis.updateContent' request.
  */
 class AnalysisUpdateContent extends ServerOperation {
   /**
    * The path of the file whose content is being updated.
    */
   String filePath;
@@ skipping 27 matching lines @@
 
 /**
  * An operation to be performed during the simulation.
  */
 abstract class ServerOperation {
   /**
    * Perform this operation by communicating with the given [server].
    */
   void perform(Server server);
 }