extract StaticMemberContributor from PrefixedElementContributor

pkg/analysis_server/lib/src/services/completion/prefixed_element_contributor.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.contributor.dart.invocation;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analysis_server/src/services/completion/local_declaration_visitor.dart';
@@ skipping 283 matching lines @@
       }
     }
     return new Future.value(false);
   }
 
   @override
   Future<bool> visitClassElement(ClassElement element) {
     if (element != null) {
       InterfaceType type = element.type;
       if (type != null) {
-        StaticClassElementSuggestionBuilder.suggestionsFor(
-            request, type.element);
+        // Suggested by StaticMemberContributor
+        // StaticClassElementSuggestionBuilder.suggestionsFor(
+        //     request, type.element);
       }
     }
     return new Future.value(false);
   }
 
   @override
   Future<bool> visitElement(Element element) {
     return new Future.value(false);
   }
 
@@ skipping 40 matching lines @@
     }
     return new Future.value(false);
   }
 
   @override
   Future<bool> visitVariableElement(VariableElement element) {
     InterfaceTypeSuggestionBuilder.suggestionsFor(request, element.type);
     return new Future.value(true);
   }
 }