Added the denifition for FSP in the manifest.json file.
Added the denifition for FSP in the manifest.json file.

yoichiro/chromeos-filesystem-webdav,enom/chromeos-filesystem-webdav,yoichiro/chromeos-filesystem-webdav,webhost/chromeos-filesystem-webdav,enom/chromeos-filesystem-webdav,webhost/chromeos-filesystem-webdav