Remove more libraries directives from server

pkg/analysis_server/lib/src/status/element_writer.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 analysis_server.src.status.element_writer;
-
 import 'dart:collection';
 import 'dart:convert';
 
 import 'package:analysis_server/src/status/tree_writer.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/visitor.dart';
 import 'package:analyzer/src/dart/element/element.dart';
 
 /**
  * A visitor that will produce an HTML representation of an element structure.
@@ skipping 158 matching lines @@
     buffer.write(HTML_ESCAPE.convert(element.toString()));
     if (element.isSynthetic) {
       buffer.write('</i>');
     }
     buffer.write(' <span style="color:gray">(');
     buffer.write(element.runtimeType);
     buffer.write(')</span>');
     buffer.write('<br>');
   }
 }