Remove ExecutableElement.labels altogether.

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

 // Copyright (c) 2014, 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 analyzer.src.generated.element_handle;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/constant/value.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 487 matching lines @@
   @override
   bool get isOperator => actualElement.isOperator;
 
   @override
   bool get isStatic => actualElement.isStatic;
 
   @override
   bool get isSynchronous => actualElement.isSynchronous;
 
   @override
-  List<LabelElement> get labels => actualElement.labels;
-
-  @override
   List<ParameterElement> get parameters => actualElement.parameters;
 
   @override
   DartType get returnType => actualElement.returnType;
 
   @override
   FunctionType get type => actualElement.type;
 
   @override
   List<TypeParameterElement> get typeParameters => actualElement.typeParameters;
@@ skipping 631 matching lines @@
 
   @override
   bool get isStatic => actualElement.isStatic;
 
   @override
   DartType get type => actualElement.type;
 
   @override
   DartObject computeConstantValue() => actualElement.computeConstantValue();
 }