Remove more libraries directives from server

pkg/analysis_server/lib/src/services/dependencies/library_dependencies.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.dependencies.library;
-
 import 'package:analyzer/dart/element/element.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:analyzer/src/generated/source_io.dart';
 
 class LibraryDependencyCollector {
   final Set<LibraryElement> _visitedLibraries = new Set<LibraryElement>();
   final Set<String> _dependencies = new Set<String>();
 
@@ skipping 43 matching lines @@
     }
   }
 
   Map<AnalysisContext, Folder> _reverse(Map<Folder, AnalysisContext> map) {
     Map<AnalysisContext, Folder> reverseMap =
         new Map<AnalysisContext, Folder>();
     map.forEach((Folder f, AnalysisContext c) => reverseMap[c] = f);
     return reverseMap;
   }
 }