fix constructor suggestion element names

pkg/analysis_server/lib/src/services/completion/dart_completion_cache.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 services.completion.dart.cache;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analysis_server/src/protocol_server.dart'
@@ skipping 168 matching lines @@
    */
   void _addConstructorSuggestions(ClassElement classElem, int relevance) {
     String className = classElem.name;
     for (ConstructorElement constructor in classElem.constructors) {
       if (!constructor.isPrivate) {
         CompletionSuggestion suggestion =
             createSuggestion(constructor, relevance: relevance);
         String name = suggestion.completion;
         name = name.length > 0 ? '$className.$name' : className;
         suggestion.completion = name;
-        suggestion.element.name = name;
         suggestion.selectionOffset = suggestion.completion.length;
         importedConstructorSuggestions.add(suggestion);
       }
     }
   }
 
   /**
    * Add suggestions for implicitly imported elements in dart:core.
    */
   void _addDartCoreSuggestions() {
@@ skipping 177 matching lines @@
   @override
   void visitFunctionTypeAliasElement(FunctionTypeAliasElement element) {
     cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
   }
 
   @override
   void visitTopLevelVariableElement(TopLevelVariableElement element) {
     cache._addSuggestion(element, DART_RELEVANCE_DEFAULT);
   }
 }