Assuming you've installed the extension you can grab its source from Chrome .config directory * which I imported and updated to github: https://github.com/justinkelly/chrome-rss
The actual original source in SVN/Git may already be public but i've no idea where it is - somewhere deep in the chromium repo??
* https://github.com/justinkelly/chrome-rss/blob/master/common...
<!-- * Copyright (c) 2009 The Chromium Authors. All rights reserved. Use of this * source code is governed by a BSD-style license that can be found in the * LICENSE file. -->
As for the original source, it's not in the Chromium repo:
<!-- * Copyright (c) 2009 The Chromium Authors. All rights reserved. Use of this * source code is governed by a BSD-style license that can be found in the * LICENSE file. -->