Convert /** comments to /// in pub.

utils/pub/oauth2.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 oauth2;
 
 import 'dart:io';
 import 'dart:uri';
 
 // TODO(nweiz): Make this a "package:" URL, or something nicer than this.
@@ skipping 196 matching lines @@
   log.message(
       'Pub needs your authorization to upload packages on your behalf.\n'
       'In a web browser, go to $authUrl\n'
       'Then click "Allow access".\n\n'
       'Waiting for your authorization...');
 
   return completer.future.transform((client) {
     log.message('Successfully authorized.\n');
     return client;
   });
-}
+}