Restore visitLabelElement() and visitLocalVariableElement().

pkg/analyzer/lib/dart/element/element.dart

Index: pkg/analyzer/lib/dart/element/element.dart
diff --git a/pkg/analyzer/lib/dart/element/element.dart b/pkg/analyzer/lib/dart/element/element.dart
index 2072fe63fb20d3f9de238b28a32ee951dedf4286..ce89e898f89f7552b1b173f38ab3e590679e51ad 100644
--- a/pkg/analyzer/lib/dart/element/element.dart
+++ b/pkg/analyzer/lib/dart/element/element.dart
@@ -1063,8 +1063,12 @@ abstract class ElementVisitor<R> {
 
   R visitImportElement(ImportElement element);
 
+  R visitLabelElement(LabelElement element);
+
   R visitLibraryElement(LibraryElement element);
 
+  R visitLocalVariableElement(LocalVariableElement element);
+
   R visitMethodElement(MethodElement element);
 
   R visitMultiplyDefinedElement(MultiplyDefinedElement element);