Use pkg/http pervasively in pub.

utils/tests/pub/pub_lish_test.dart

 // Copyright (c) 2012, 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_lish_test;
 
 import 'dart:io';
 import 'dart:json';
 
 import 'test_pub.dart';
@@ skipping 226 matching lines @@
   });
 
   test('package creation provides an error', () {
     var server = new ScheduledServer();
     credentialsFile(server, 'access token').scheduleCreate();
     var pub = startPubLish(server);
     handleUploadForm(server);
     handleUpload(server);
 
     server.handle('GET', '/create', (request, response) {
+      response.statusCode = 400;
       response.outputStream.writeString(JSON.stringify({
         'error': {'message': 'Your package was too boring.'}
       }));
       return closeHttpResponse(request, response);
     });
 
     expectLater(pub.nextErrLine(), equals('Your package was too boring.'));
     pub.shouldExit(1);
 
     run();
@@ skipping 52 matching lines @@
       return closeHttpResponse(request, response);
     });
 
     expectLater(pub.nextErrLine(), equals('Invalid server response:'));
     expectLater(pub.nextErrLine(), equals(JSON.stringify(body)));
     pub.shouldExit(1);
 
     run();
   });
 }