update completion sorter to new API

pkg/analysis_server/test/domain_completion_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.domain.completion;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/channel/channel.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/context_manager.dart';
 import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analysis_server/src/domain_completion.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analysis_server/src/provisional/completion/completion_core.dart'
-    show CompletionRequest, CompletionResult;
+    show AnalysisRequest, CompletionRequest, CompletionResult;
 import 'package:analysis_server/src/provisional/completion/completion_dart.dart'
     as newApi;
 import 'package:analysis_server/src/services/completion/completion_manager.dart';
 import 'package:analysis_server/src/services/completion/contribution_sorter.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
 import 'package:analysis_server/src/services/index/index.dart' show Index;
 import 'package:analysis_server/src/services/index/local_memory_index.dart';
 import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
@@ skipping 690 matching lines @@
     return source.contents;
   }
 
   noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
 }
 
 class MockRelevancySorter implements ContributionSorter {
   bool enabled = true;
 
   @override
-  void sort(newApi.DartCompletionRequest request,
-      List<CompletionSuggestion> suggestions) {
+  AnalysisRequest sort(CompletionRequest request,
+      Iterable<CompletionSuggestion> suggestions) {
     if (!enabled) {
       throw 'unexpected sort';
     }
+    return null;
   }
 }
 
 /**
  * Mock stream for tracking calls to listen and subscription.cancel.
  */
 class MockStream<E> implements Stream<E> {
   MockSubscription<E> mockSubscription = new MockSubscription<E>();
   int listenCount = 0;
 
@@ skipping 101 matching lines @@
 }
     ''');
     await waitForTasksFinished();
     Request request =
         new CompletionGetSuggestionsParams(testFile, 0).toRequest('0');
     Response response = handler.handleRequest(request);
     expect(response.error, isNotNull);
     expect(response.error.code, RequestErrorCode.NO_INDEX_GENERATED);
   }
 }