As far as I can tell the method LocalFileSystem.isFileSystemRoot(path) is a carry over from the BlackBerry implementation and is not used by the other platforms. Its also not part of the W3C File API. Is it ok to delete? I have changes for the BlackBerry implementation which no longer require it.
https://github.com/apache/incubator-cordova-js/blob/master/lib/plugin/LocalFileSystem.js
