Remove more libraries directives from server

pkg/analysis_server/lib/src/services/completion/dart/field_formal_contributor.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 services.completion.contributor.dart.field_formal;
-
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol_server.dart'
     hide Element, ElementKind;
 import 'package:analysis_server/src/provisional/completion/dart/completion_dart.dart';
 import 'package:analysis_server/src/services/completion/dart/suggestion_builder.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 
 /**
  * A contributor for calculating invocation / access suggestions
@@ skipping 54 matching lines @@
                 }
               }
             }
           }
         }
       }
     }
     return suggestions;
   }
 }