Remove usage of dart:json.

samples/tests/samples/chat/chat_server_test.dart

 // Copyright (c) 2013, 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.
 //
 // VMOptions=
 // VMOptions=--short_socket_read
 // VMOptions=--short_socket_write
 // VMOptions=--short_socket_read --short_socket_write
 
 import "package:expect/expect.dart";
 import 'dart:io';
 import 'dart:isolate';
-import 'dart:json' as json;
+import "dart:convert";
 import '../../../chat/chat_server_lib.dart';
 
 // Message to start chat test client running in an isolate.
 class ChatTestClientStart {
   ChatTestClientStart(int this.totalClients,
                       int this.messagesToSend,
                       int this.messagesToReceive,
                       int this.port);
 
   int totalClients;
@@ skipping 24 matching lines @@
 
   String sessionId;  // Session id when connected.
   int sendMessageNumber;  // Number of messages sent.
   int joinCount;
   int messageCount;
   int receiveMessageNumber;  // Number of messages received.
 
   void leave() {
     void leaveResponseHandler(response, String data) {
       Expect.equals(HttpStatus.OK, response.statusCode);
-      var responseData = json.parse(data);
+      var responseData = JSON.decode(data);
       Expect.equals("leave", responseData["response"]);
 
       // Test done.
       statusPort.send("Test succeeded", null);
     }
 
     Map leaveRequest = new Map();
     leaveRequest["request"] = "leave";
     leaveRequest["sessionId"] = sessionId;
     httpClient.post("127.0.0.1", port, "/leave")
       .then((HttpClientRequest request) {
-        request.write(json.stringify(leaveRequest));
+        request.write(JSON.encode(leaveRequest));
         return request.close();
       })
       .then((HttpClientResponse response) {
         StringBuffer body = new StringBuffer();
         response.listen(
           (data) => body.write(new String.fromCharCodes(data)),
           onDone: () => leaveResponseHandler(response, body.toString()));
       });
   }
 
   void receive() {
     void receiveResponseHandler(response, String data) {
       Expect.equals(HttpStatus.OK, response.statusCode);
-      var responseData = json.parse(data);
+      var responseData = JSON.decode(data);
       Expect.equals("receive", responseData["response"]);
       Expect.equals(null, responseData["disconnect"]);
       for (int i = 0; i < responseData["messages"].length; i++) {
         Map message = responseData["messages"][i];
         if (message["type"] == "join") {
           joinCount++;
         } else if (message["type"] == "message") {
           messageCount++;
         } else {
           Expect.equals("leave", message["type"]);
@@ skipping 21 matching lines @@
         leave();
       }
     }
 
     Map receiveRequest = new Map();
     receiveRequest["request"] = "receive";
     receiveRequest["sessionId"] = sessionId;
     receiveRequest["nextMessage"] = receiveMessageNumber;
     httpClient.post("127.0.0.1", port, "/receive")
       .then((HttpClientRequest request) {
-        request.write(json.stringify(receiveRequest));
+        request.write(JSON.encode(receiveRequest));
         return request.close();
       })
       .then((HttpClientResponse response) {
         StringBuffer body = new StringBuffer();
         response.listen(
           (data) => body.write(new String.fromCharCodes(data)),
           onDone: () => receiveResponseHandler(response, body.toString()));
       });
   }
 
   void sendMessage() {
     void sendResponseHandler(response, String data) {
       Expect.equals(HttpStatus.OK, response.statusCode);
-      var responseData = json.parse(data);
+      var responseData = JSON.decode(data);
       Expect.equals("message", responseData["response"]);
       sendMessageNumber++;
       if (sendMessageNumber < messagesToSend) {
         sendMessage();
       } else {
         receive();
       }
     }
 
     Map messageRequest = new Map();
     messageRequest["request"] = "message";
     messageRequest["sessionId"] = sessionId;
     messageRequest["message"] = "message $sendMessageNumber";
     httpClient.post("127.0.0.1", port, "/message")
       .then((HttpClientRequest request) {
-        request.write(json.stringify(messageRequest));
+        request.write(JSON.encode(messageRequest));
         return request.close();
       })
       .then((HttpClientResponse response) {
         StringBuffer body = new StringBuffer();
         response.listen(
           (data) => body.write(new String.fromCharCodes(data)),
           onDone: () => sendResponseHandler(response, body.toString()));
       });
   }
 
   void join() {
     void joinResponseHandler(response, String data) {
       Expect.equals(HttpStatus.OK, response.statusCode);
-      var responseData = json.parse(data);
+      var responseData = JSON.decode(data);
       Expect.equals("join", responseData["response"]);
       sessionId = responseData["sessionId"];
       Expect.isTrue(sessionId != null);
 
       joinCount = 0;
       messageCount = 0;
       sendMessageNumber = 0;
       receiveMessageNumber = 0;
       sendMessage();
     }
 
     Map joinRequest = new Map();
     joinRequest["request"] = "join";
     joinRequest["handle"] = "test1";
     httpClient.post("127.0.0.1", port, "/join")
       .then((HttpClientRequest request) {
-        request.write(json.stringify(joinRequest));
+        request.write(JSON.encode(joinRequest));
         return request.close();
       })
       .then((HttpClientResponse response) {
         StringBuffer body = new StringBuffer();
         response.listen(
           (data) => body.write(new String.fromCharCodes(data)),
           onDone: () => joinResponseHandler(response, body.toString()));
       });
   }
 
@@ skipping 113 matching lines @@
   TestMain testMain = new TestMain.run(10, 2);
 }
 
 
 void main() {
   testOneClient();
   testTwoClients();
   testTwoClientsMoreMessages();
   testTenClients();
 }