Make more use of generated code in analysis server.

pkg/analysis_server/lib/src/domain_completion.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 domain.completion;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/protocol2.dart' show
-    CompletionGetSuggestionsParams;
+    CompletionGetSuggestionsParams, CompletionGetSuggestionsResult;
 import 'package:analysis_server/src/services/completion/completion_manager.dart';
 import 'package:analysis_server/src/services/completion/completion_suggestion.dart';
 
 /**
  * Instances of the class [CompletionDomainHandler] implement a [RequestHandler]
  * that handles requests in the search domain.
  */
 class CompletionDomainHandler implements RequestHandler {
   /**
    * The analysis server that is using this handler to process requests.
@@ skipping 37 matching lines @@
         params.offset,
         server.searchEngine).results().listen((CompletionResult result) {
       sendCompletionNotification(
           completionId,
           result.replacementOffset,
           result.replacementLength,
           result.suggestions,
           result.last);
     });
     // initial response without results
-    return new Response(request.id)..setResult(ID, completionId);
+    return new CompletionGetSuggestionsResult(completionId).toResponse(
+        request.id);
   }
 
   /**
    * Send completion notification results.
    */
   void sendCompletionNotification(String completionId, int replacementOffset,
       int replacementLength, Iterable<CompletionSuggestion> results, bool isLast) {
     Notification notification = new Notification(COMPLETION_RESULTS);
     notification.setParameter(ID, completionId);
     notification.setParameter(REPLACEMENT_OFFSET, replacementOffset);
     notification.setParameter(REPLACEMENT_LENGTH, replacementLength);
     notification.setParameter(RESULTS, results);
     notification.setParameter(LAST, isLast);
     server.sendNotification(notification);
   }
 }