move LocalReferenceContributor to new API

pkg/analysis_server/lib/src/services/completion/dart/label_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.local_ref;
+library services.completion.contributor.dart.label;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart' as protocol
     show Element, ElementKind;
 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/local_declaration_visitor.dart'
     show LocalDeclarationVisitor;
@@ skipping 261 matching lines @@
   String name = id.name;
   if (name == null || name.length <= 0) {
     return DYNAMIC;
   }
   TypeArgumentList typeArgs = type.typeArguments;
   if (typeArgs != null) {
     //TODO (danrubel) include type arguments
   }
   return name;
 }