Refactor Source and SourceRegistry.

lib/src/command/uploader.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.
 
 import 'dart:async';
 
 import 'package:path/path.dart' as path;
 
 import '../command.dart';
 import '../entrypoint.dart';
 import '../exit_codes.dart' as exit_codes;
 import '../http.dart';
 import '../io.dart';
 import '../log.dart' as log;
 import '../oauth2.dart' as oauth2;
-import '../source/hosted.dart';
 
 /// Handles the `uploader` pub command.
 class UploaderCommand extends PubCommand {
   String get name => "uploader";
   String get description =>
       "Manage uploaders for a package on pub.dartlang.org.";
   String get invocation => "pub uploader [options] {add/remove} <email>";
   String get docUrl => "http://dartlang.org/tools/pub/cmd/pub-uploader.html";
 
   /// The URL of the package hosting server.
   Uri get server => Uri.parse(argResults['server']);
 
   UploaderCommand() {
-    argParser.addOption('server', defaultsTo: HostedSource.defaultUrl,
+    argParser.addOption('server', defaultsTo: cache.sources.hosted.defaultUrl,
         help: 'The package server on which the package is hosted.');
     argParser.addOption('package',
         help: 'The package whose uploaders will be modified.\n'
               '(defaults to the current package)');
   }
 
   Future run() {
     if (argResults.rest.isEmpty) {
       log.error('No uploader command given.');
       this.printUsage();
@@ skipping 32 matching lines @@
               "${Uri.encodeComponent(package)}/uploaders/"
               "${Uri.encodeComponent(uploader)}");
           return client.delete(url, headers: PUB_API_HEADERS);
         }
       });
     }).then(handleJsonSuccess)
       .catchError((error) => handleJsonError(error.response),
                   test: (e) => e is PubHttpException);
   }
 }