Make Change implementation consistent with the server spec.

pkg/analysis_server/lib/src/edit/fix.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 edit.fix;
 
 import 'package:analysis_server/src/computer/error.dart';
 import 'package:analysis_services/constants.dart';
 import 'package:analysis_services/correction/change.dart';
 import 'package:analysis_services/correction/fix.dart';
@@ skipping 14 matching lines @@
   @override
   Map<String, Object> toJson() {
     return {
       ERROR: error.toJson(),
       FIXES: objectToJson(fixes)
     };
   }
 
   @override
   String toString() => 'ErrorFixes(error=$error, fixes=$fixes)';
-
-  static ErrorFixes fromJson(Map<String, Object> json) {
-    AnalysisError error = AnalysisError.fromJson(json[ERROR]);
-    ErrorFixes errorFixes = new ErrorFixes(error);
-    errorFixes.fixes.addAll((json[FIXES] as List).map((json) {
-      return Change.fromJson(json);
-    }));
-    return errorFixes;
-  }
 }