rename completion computer to contributor

pkg/analysis_server/lib/src/services/completion/combinator_computer.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.computer.dart.combinator;
+library services.completion.contributor.dart.combinator;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol_server.dart'
     hide Element, ElementKind;
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analysis_server/src/services/completion/suggestion_builder.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 
 /**
- * A computer for calculating `completion.getSuggestions` request results
+ * A contributor for calculating `completion.getSuggestions` request results
  * for the import combinators show and hide.
  */
-class CombinatorComputer extends DartCompletionComputer {
+class CombinatorContributor extends DartCompletionContributor {
   _CombinatorSuggestionBuilder builder;
 
   @override
   bool computeFast(DartCompletionRequest request) {
     builder = request.target.containingNode
         .accept(new _CombinatorAstVisitor(request));
     return builder == null;
   }
 
   @override
@@ skipping 42 matching lines @@
     var directive = node.getAncestor((parent) => parent is NamespaceDirective);
     if (directive is NamespaceDirective) {
       LibraryElement library = directive.uriElement;
       if (library != null) {
         library.visitChildren(this);
       }
     }
     return new Future.value(false);
   }
 }