Change integration test notifications to use structured objects.

pkg/analysis_server/test/integration/analysis/get_errors.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.integration.analysis.get.errors;
 
 import 'dart:async';
 
 import 'package:unittest/unittest.dart';
 
@@ skipping 15 matching lines @@
   test_getErrors() {
     String pathname = sourcePath('test.dart');
     String text = r'''
 main() {
   var x // parse error: missing ';'
 }''';
     writeFile(pathname, text);
     standardAnalysisSetup();
     Future finishTest() {
       return sendAnalysisGetErrors(pathname).then((result) {
-        expect(
-            result.errors.map((error) => error.toJson()),
-            equals(currentAnalysisErrors[pathname]));
+        expect(result.errors, equals(currentAnalysisErrors[pathname]));
       });
     }
     if (afterAnalysis) {
       return analysisFinished.then((_) => finishTest());
     } else {
       return finishTest();
     }
   }
 }