Remove 'errorCode' field from AnalysisError in the analysis server API.

pkg/analysis_server/test/integration/integration_tests.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;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:convert';
 import 'dart:io';
@@ skipping 191 matching lines @@
   'startLine': isInt,
   'startColumn': isInt
 });
 
 final Matcher isAnalysisError = new MatchesJsonObject('AnalysisError', {
   'severity': isErrorSeverity,
   'type': isErrorType,
   'location': isLocation,
   'message': isString,
 }, optionalFields: {
-  'correction': isString,
-  // TODO(paulberry): remove 'errorCode' once server stops sending it
-  'errorCode': anything
+  'correction': isString
 });
 
 const Matcher isAnalysisStatus = const MatchesJsonObject('AnalysisStatus', const
     {
   'analyzing': isBool
 }, optionalFields: const {
   'analysisTarget': isString
 });
 
 
@@ skipping 307 matching lines @@
    * Record a message that was exchanged with the server, and print it out if
    * [debugStdio] has been called.
    */
   void _recordStdio(String line) {
     if (_debuggingStdio) {
       print(line);
     }
     _recordedStdio.add(line);
   }
 }