Move LocalDeclarationVisitor for use by contributors that will be moved to analyzer_plugin

pkg/analysis_server/lib/src/services/completion/dart/label_contributor.dart

Index: pkg/analysis_server/lib/src/services/completion/dart/label_contributor.dart
diff --git a/pkg/analysis_server/lib/src/services/completion/dart/label_contributor.dart b/pkg/analysis_server/lib/src/services/completion/dart/label_contributor.dart
index 5bde1b3e7a67c0cf5677b694ef946463805da851..99fc593114edd95b5d9dc0fc012a0a22157db60e 100644
--- a/pkg/analysis_server/lib/src/services/completion/dart/label_contributor.dart
+++ b/pkg/analysis_server/lib/src/services/completion/dart/label_contributor.dart
@@ -9,13 +9,13 @@ import 'package:analysis_server/src/protocol_server.dart'
 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/local_declaration_visitor.dart'
-    show LocalDeclarationVisitor;
 import 'package:analysis_server/src/services/completion/dart/optype.dart';
 import 'package:analysis_server/src/services/completion/dart/utilities.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer_plugin/protocol/protocol_common.dart' as protocol
     show ElementKind;
+import 'package:analyzer_plugin/src/utilities/visitors/local_declaration_visitor.dart'
+    show LocalDeclarationVisitor;
 
 /**
  * A contributor for calculating label suggestions.