Renames to move closer to the 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/completion/completion_core.dart'
-    show CompletionRequest;
+    show CompletionRequest, CompletionResult;
 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/protocol.dart';
 import 'package:analysis_server/src/services/completion/completion_manager.dart';
 import 'package:analysis_server/src/services/completion/dart_completion_manager.dart';
@@ skipping 541 matching lines @@
   MockCompletionManager(this.context, this.source, this.searchEngine);
 
   @override
   Future<bool> computeCache() {
     return new Future.value(true);
   }
 
   @override
   void computeSuggestions(CompletionRequest request) {
     ++computeCallCount;
-    CompletionResult result = new CompletionResult(0, 0, [], true);
+    CompletionResult result = new CompletionResultImpl(0, 0, [], true);
     controller.add(result);
   }
 
   @override
   void dispose() {
     ++disposeCallCount;
   }
 
   @override
   Stream<CompletionResult> results(CompletionRequest request) {
@@ skipping 137 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);
   }
 }