Remove ExecutableElement.labels altogether.

pkg/analyzer/lib/src/dart/element/member.dart

Index: pkg/analyzer/lib/src/dart/element/member.dart
diff --git a/pkg/analyzer/lib/src/dart/element/member.dart b/pkg/analyzer/lib/src/dart/element/member.dart
index d74e1bf3e49c7bdc8c2404ccb3748c00b7690ad5..4a4c88cf3809634e9d70012e26be8234dadc269f 100644
--- a/pkg/analyzer/lib/src/dart/element/member.dart
+++ b/pkg/analyzer/lib/src/dart/element/member.dart
@@ -174,9 +174,6 @@ abstract class ExecutableMember extends Member implements ExecutableElement {
   bool get isSynchronous => baseElement.isSynchronous;
 
   @override
-  List<LabelElement> get labels => baseElement.labels;
-
-  @override
   List<ParameterElement> get parameters => type.parameters;
 
   @override
@@ -197,7 +194,6 @@ abstract class ExecutableMember extends Member implements ExecutableElement {
     // below so that we can safely invoke them.
     super.visitChildren(visitor);
     safelyVisitChildren(baseElement.functions, visitor);
-    safelyVisitChildren(labels, visitor);
     safelyVisitChildren(parameters, visitor);
   }
 }