Remove usage of dart:json.

sdk/lib/_internal/pub/test/pub_uploader_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.
 
 library pub_uploader_test;
 
+import 'dart:convert';
 import 'dart:io';
-import 'dart:json' as json;
 
 import 'package:scheduled_test/scheduled_process.dart';
 import 'package:scheduled_test/scheduled_server.dart';
 import 'package:scheduled_test/scheduled_test.dart';
 
 import '../lib/src/io.dart';
 import '../lib/src/utils.dart';
 import 'descriptor.dart' as d;
 import 'test_pub.dart';
 
@@ skipping 39 matching lines @@
     var server = new ScheduledServer();
     d.credentialsFile(server, 'access token').create();
     var pub = startPubUploader(server, ['--package', 'pkg', 'add', 'email']);
 
     server.handle('POST', '/api/packages/pkg/uploaders', (request) {
       expect(new ByteStream(request).toBytes().then((bodyBytes) {
         expect(new String.fromCharCodes(bodyBytes), equals('email=email'));
 
         request.response.headers.contentType =
             new ContentType("application", "json");
-        request.response.write(json.stringify({
+        request.response.write(JSON.encode({
           'success': {'message': 'Good job!'}
         }));
         request.response.close();
       }), completes);
     });
 
     expect(pub.nextLine(), completion(equals('Good job!')));
     pub.shouldExit(0);
   });
 
   integration('removes an uploader', () {
     var server = new ScheduledServer();
     d.credentialsFile(server, 'access token').create();
     var pub = startPubUploader(server, ['--package', 'pkg', 'remove', 'email']);
 
     server.handle('DELETE', '/api/packages/pkg/uploaders/email', (request) {
       request.response.headers.contentType =
           new ContentType("application", "json");
-      request.response.write(json.stringify({
+      request.response.write(JSON.encode({
         'success': {'message': 'Good job!'}
       }));
       request.response.close();
     });
 
     expect(pub.nextLine(), completion(equals('Good job!')));
     pub.shouldExit(0);
   });
 
   integration('defaults to the current package', () {
     d.validPackage.create();
 
     var server = new ScheduledServer();
     d.credentialsFile(server, 'access token').create();
     var pub = startPubUploader(server, ['add', 'email']);
 
     server.handle('POST', '/api/packages/test_pkg/uploaders', (request) {
       request.response.headers.contentType =
           new ContentType("application", "json");
-      request.response.write(json.stringify({
+      request.response.write(JSON.encode({
         'success': {'message': 'Good job!'}
       }));
       request.response.close();
     });
 
     expect(pub.nextLine(), completion(equals('Good job!')));
     pub.shouldExit(0);
   });
 
   integration('add provides an error', () {
     var server = new ScheduledServer();
     d.credentialsFile(server, 'access token').create();
     var pub = startPubUploader(server, ['--package', 'pkg', 'add', 'email']);
 
     server.handle('POST', '/api/packages/pkg/uploaders', (request) {
       request.response.statusCode = 400;
       request.response.headers.contentType =
           new ContentType("application", "json");
-      request.response.write(json.stringify({
+      request.response.write(JSON.encode({
         'error': {'message': 'Bad job!'}
       }));
       request.response.close();
     });
 
     expect(pub.nextErrLine(), completion(equals('Bad job!')));
     pub.shouldExit(1);
   });
 
   integration('remove provides an error', () {
     var server = new ScheduledServer();
     d.credentialsFile(server, 'access token').create();
     var pub = startPubUploader(server,
         ['--package', 'pkg', 'remove', 'e/mail']);
 
     server.handle('DELETE', '/api/packages/pkg/uploaders/e%2Fmail', (request) {
       request.response.statusCode = 400;
       request.response.headers.contentType =
           new ContentType("application", "json");
-      request.response.write(json.stringify({
+      request.response.write(JSON.encode({
         'error': {'message': 'Bad job!'}
       }));
       request.response.close();
     });
 
     expect(pub.nextErrLine(), completion(equals('Bad job!')));
     pub.shouldExit(1);
   });
 
   integration('add provides invalid JSON', () {
@@ skipping 19 matching lines @@
     server.handle('DELETE', '/api/packages/pkg/uploaders/email', (request) {
       request.response.write("{not json");
       request.response.close();
     });
 
     expect(pub.nextErrLine(), completion(equals('Invalid server response:')));
     expect(pub.nextErrLine(), completion(equals('{not json')));
     pub.shouldExit(1);
   });
 }