Use Element.nameLength where possible.

pkg/analysis_server/test/services/index/dart_index_contributor_test.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 test.services.src.index.dart_index_contributor;
 
 import 'package:analysis_server/analysis/index_core.dart';
 import 'package:analysis_server/src/services/index/index.dart';
 import 'package:analysis_server/src/services/index/index_contributor.dart';
 import 'package:analysis_server/src/services/index/index_store.dart';
@@ skipping 1562 matching lines @@
     indexDartUnit(store, context, null);
   }
 
   void test_nullUnitElement() {
     CompilationUnit unit = new CompilationUnit(null, null, [], [], null);
     indexDartUnit(store, context, unit);
   }
 
   void _assertDefinesTopLevelElement(Element element) {
     ExpectedLocation location = new ExpectedLocation(
-        element, element.nameOffset, element.name.length, false, true);
+        element, element.nameOffset, element.nameLength, false, true);
     _assertRecordedRelationForElement(
         testLibraryElement, IndexConstants.DEFINES, location);
     expect(recordedTopElements, contains(element));
   }
 
   /**
    * Asserts that [recordedRelations] has no item with the specified properties.
    */
   void _assertNoRecordedRelation(IndexableObject expectedIndexable,
       RelationshipImpl relationship, ExpectedLocation location) {
@@ skipping 129 matching lines @@
   RecordedRelation(this.indexable, this.relationship, this.location);
 
   @override
   String toString() {
     return 'RecordedRelation(indexable=$indexable; relationship=$relationship; '
         'location=$location; flags='
         '${location.isQualified ? "Q" : ""}'
         '${location.isResolved ? "R" : ""})';
   }
 }