Use Element.nameLength where possible.

pkg/analyzer/lib/src/generated/element.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 engine.element;
 
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/utilities_general.dart';
 import 'package:analyzer/src/task/dart.dart';
@@ skipping 8448 matching lines @@
   @override
   ElementLocation get location => null;
 
   @override
   List<ElementAnnotation> get metadata => ElementAnnotation.EMPTY_LIST;
 
   @override
   String get name => _name;
 
   @override
-  int get nameLength => name != null ? name.length : 0;
+  int get nameLength => displayName != null ? displayName.length : 0;
 
   @override
   int get nameOffset => -1;
 
   @deprecated
   @override
   AstNode get node => null;
 
   @override
   Source get source => null;
@@ skipping 2325 matching lines @@
 
   @override
   void visitElement(Element element) {
     int offset = element.nameOffset;
     if (offset != -1) {
       map[offset] = element;
     }
     super.visitElement(element);
   }
 }