Remove the command-line plugin

pkg/analyzer/test/source/error_processor_test.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.
 
 library analyzer.test.source.error_processor;
 
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/source/analysis_options_provider.dart';
 import 'package:analyzer/source/error_processor.dart';
 import 'package:analyzer/src/context/context.dart';
@@ skipping 144 matching lines @@
       optionsProvider.getOptionsFromString(options);
   applyToAnalysisOptions(context.analysisOptions, optionMap);
 }
 
 ErrorProcessor getProcessor(AnalysisError error) =>
     ErrorProcessor.getProcessor(context, error);
 
 void oneTimeSetup() {
   List<Plugin> plugins = <Plugin>[];
   plugins.addAll(AnalysisEngine.instance.requiredPlugins);
-  plugins.add(AnalysisEngine.instance.commandLinePlugin);
   ExtensionManager manager = new ExtensionManager();
   manager.processPlugins(plugins);
 }
 
 class TestContext extends AnalysisContextImpl {}