Remove more libraries directives from server

pkg/analysis_server/lib/src/services/completion/dart/variable_name_contributor.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 services.completion.contributor.dart.variableName;
-
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol_server.dart'
     show CompletionSuggestion, CompletionSuggestionKind;
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
 import 'package:analysis_server/src/services/completion/dart/completion_manager.dart'
     show DartCompletionRequestImpl;
 import 'package:analysis_server/src/services/completion/dart/optype.dart';
 import 'package:analysis_server/src/services/correction/name_suggestion.dart';
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 75 matching lines @@
         CompletionSuggestion suggestion = _createNameSuggestion(varName);
         if (suggestion != null) {
           suggestions.add(suggestion);
         }
       }
       return suggestions;
     }
     return EMPTY_LIST;
   }
 }