Remove some more library directives

pkg/analysis_server/test/operation/operation_queue_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.
 
-library test.operation.queue;
-
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analysis_server/src/operation/operation.dart';
 import 'package:analysis_server/src/operation/operation_analysis.dart';
 import 'package:analysis_server/src/operation/operation_queue.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:test/test.dart';
@@ skipping 226 matching lines @@
   @override
   ServerOperationPriority get priority {
     return ServerOperationPriority.ANALYSIS_NOTIFICATION;
   }
 
   @override
   bool shouldBeDiscardedOnSourceChange(Source source) {
     return source == this.source;
   }
 }