Change integration test send...() methods to return structured objects.

pkg/analysis_server/tool/spec/codegen_dart_protocol.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 codegen.protocol;
 
 import 'dart:convert';
 
 import 'api.dart';
 import 'codegen_dart.dart';
@@ skipping 1212 matching lines @@
         inputType = 'Request';
         inputName = 'request';
         fieldName = '_params';
         makeDecoder = 'new RequestDecoder(request)';
         constructorName = 'fromRequest';
         break;
       case 'requestResult':
         inputType = 'Response';
         inputName = 'response';
         fieldName = '_result';
-        makeDecoder = 'new ResponseDecoder(response)';
+        makeDecoder =
+            'new ResponseDecoder(REQUEST_ID_REFACTORING_KINDS.remove(response.id))';
         constructorName = 'fromResponse';
         break;
       case 'notificationParams':
         inputType = 'Notification';
         inputName = 'notification';
         fieldName = '_params';
         makeDecoder = 'new ResponseDecoder(null)';
         constructorName = 'fromNotification';
         break;
       case 'refactoringOptions':
@@ skipping 40 matching lines @@
   CodegenProtocolVisitor visitor = new CodegenProtocolVisitor(readApi());
   return visitor.collectCode(visitor.visitApi);
 });
 
 /**
  * Translate spec_input.html into protocol_matchers.dart.
  */
 main() {
   target.generate();
 }