Remove Futures class, move methods to Future.

utils/pub/hosted_source.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 hosted_source;
 
 import 'dart:async';
 import 'dart:io' as io;
 import 'dart:json' as json;
 import 'dart:uri';
@@ skipping 54 matching lines @@
     var parsedDescription = _parseDescription(id.description);
     var name = parsedDescription.first;
     var url = parsedDescription.last;
 
     var fullUrl = "$url/packages/$name/versions/${id.version}.tar.gz";
 
     log.message('Downloading $id...');
 
     // Download and extract the archive to a temp directory.
     var tempDir;
-    return Futures.wait([
+    return Future.wait([
       httpClient.send(new http.Request("GET", new Uri.fromString(fullUrl)))
           .then((response) => response.stream),
       systemCache.createTempDir()
     ]).then((args) {
       var stream = streamToInputStream(args[0]);
       tempDir = args[1];
       return timeout(extractTarGz(stream, tempDir), HTTP_TIMEOUT,
           'fetching URL "$fullUrl"');
     }).then((_) {
       // Now that the install has succeeded, move it to the real location in
@@ skipping 74 matching lines @@
 
     var name = description["name"];
     if (name is! String) {
       throw new FormatException("The 'name' key must have a string value.");
     }
 
     var url = description.containsKey("url") ? description["url"] : defaultUrl;
     return new Pair<String, String>(name, url);
   }
 }