Use Element.nameLength where possible.

pkg/analysis_server/lib/src/domains/analysis/implemented_dart.dart

 // Copyright (c) 2015, 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 domains.analysis.implemented_dart;
 
 import 'package:analysis_server/src/protocol_server.dart' as protocol;
 import 'package:analysis_server/src/services/search/hierarchy.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analyzer/src/generated/element.dart';
@@ skipping 15 matching lines @@
       if (subtypes.isNotEmpty) {
         _addImplementedClass(type);
       }
       type.accessors.forEach(_addMemberIfImplemented);
       type.fields.forEach(_addMemberIfImplemented);
       type.methods.forEach(_addMemberIfImplemented);
     }
   }
 
   void _addImplementedClass(ClassElement type) {
-    String name = type.name;
-    if (name != null) {
-      int offset = type.nameOffset;
-      int length = name.length;
-      classes.add(new protocol.ImplementedClass(offset, length));
-    }
+    int offset = type.nameOffset;
+    int length = type.nameLength;
+    classes.add(new protocol.ImplementedClass(offset, length));
   }
 
   void _addImplementedMember(Element member) {
-    String name = member.displayName;
-    if (name != null) {
-      int offset = member.nameOffset;
-      int length = name.length;
-      members.add(new protocol.ImplementedMember(offset, length));
-    }
+    int offset = member.nameOffset;
+    int length = member.nameLength;
+    members.add(new protocol.ImplementedMember(offset, length));
   }
 
   void _addMemberIfImplemented(Element element) {
     if (!element.isSynthetic) {
       String name = element.displayName;
       if (name != null && _hasOverride(name)) {
         _addImplementedMember(element);
       }
     }
   }
 
   bool _hasOverride(String name) {
     for (ClassElement subtype in subtypes) {
       if (subtype.getMethod(name) != null) {
         return true;
       }
       if (subtype.getField(name) != null) {
         return true;
       }
     }
     return false;
   }
 }