more progress implementing analysis server code completion

pkg/analysis_server/test/protocol_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.protocol;
 
 import 'dart:convert';
 
 import 'package:analysis_server/src/protocol.dart';
+import 'package:analysis_services/json.dart';
 import 'package:analysis_testing/reflective_tests.dart';
 import 'package:unittest/unittest.dart';
-import 'package:analysis_server/src/collections.dart';
 
 
 Matcher _throwsRequestFailure = throwsA(new isInstanceOf<RequestFailure>());
 
 
 main() {
   groupSep = ' | ';
   group('Notification', () {
     runReflectiveTests(NotificationTest);
   });
@@ skipping 681 matching lines @@
     response.setResult(resultName, resultValue);
     expect(response.getResult(resultName), same(resultValue));
     expect(response.toJson(), equals({
       Response.ID: '0',
       Response.RESULT: {
         resultName: resultValue
       }
     }));
   }
 }